Time and resources permitting, every effort is made to update and/or improve the SimBrief dispatch system regularly.
As a general rule, only major updates and new features get announced publicly. The vast majority of changes are made behind the scenes to either fix newly-discovered bugs or bring various other minor improvements.
Whether big or small, nearly every non-trivial update which has been made to the website over the years has been documented in the changelog below.
Updates are listed in chronological order, starting from the most recent.
Bug FixFixed incorrect custom airframe selection when editing an API-generated flight.
FeatureAdded "Show More Flights" button to the My Flights section.
UpdateImproved navlog fuel burns and times during climb phase.
UpdateMinor adjustment to taxi burns for the following aircraft: A318, A319, A320, A20N, A321.
UpdateImproved positioning of last waypoint when using the Route Finder in VOR-Only mode.
Bug FixFixed DME stations being selected when using the Route Finder in VOR-Only mode.
FeatureAdded support for local SID/STAR type exceptions.
FeatureAdded support for EDDF STAR shortcuts via RAMOB.
Bug FixFixed possible incomplete navlog on very long flights.
UpdateUpdated SID/STAR selection logic to consider the aircraft's PBN codes.
UpdateImproved route database prioritization based on RNAV/PBN capability.
Bug FixFixed possible query errors when calling the Route Finder in VOR-only mode.
UpdateUpdated route selection queries to exclude certain incomplete routes.
FeatureAdded support for SID/STAR type restrictions to the Route Finder tool.
FeatureAdded support for SID/STAR type restrictions (AIRAC 2110 and later).
FeatureAdded logic to infer engine type and performance category if missing from aircraft profile.
UpdateUpdated AIRAC database structure to support SID/STAR type restrictions.
UpdateUpdated getroutes script to prioritize SID/STARs based on aircraft type/equipment.
UpdateUpdated EU and FAXML route prioritization based on SID/STAR type restrictions.
ChangeThe automatic alternate finder now prioritizes non-military airfields where possible.
ChangeSlightly re-organizated the Dispatch Options page to allow for easier additions in the future.
ChangeLat/longs are now automatically shortened where applicable (ex. 5200N03000W = 52N030W).
FeatureAdded new OFP remarks indicating when the payload gets limited due to MZFW, MTOW, or MLW.
FeatureAdded new options when creating custom airframes: ICAO Type, Name, Engines, Performance Code, Mode-S Code, Notes/Comments, Default Cost Index.
UpdateUpdated ICAO FPL string and added Mode-S support to the following formats: LIDO, BAW, BER, DAL, DLH, ETD, EZY, GWI, KLM, QFA, RYR, THY, UAL 2014.
ChangeOFP cancellation is now pushed to the server via jQuery's unload event. This reduces unnecessary server usage by immediately cancelling the OFP process where applicable.
FeatureAdded image pre-loading function for IRSAT and SIGWX images.
Bug FixRepaired missing IRSAT images in the Database section.
UpdateImproved SIGMET parsing script to better handle unexpected patterns.
Bug FixFixed a rare interactive map depiction error for certain airways.
Bug FixFixed SkyVector and RouteFinder route string mismatch when loading/editing a previous flight.
FeatureAdded new Downloadable FMS formats: ProSim 737, X-FMC.
Bug FixFixed a route string error that could occur with altitude/speed changes on a NAT track.
Bug FixMinor corrections to the corte.in (FF320) format.
ChangeProgrammed the Options page to initially hide the Route Map (Google API quota management).
FeatureActivated old AIRAC cycles feature. Note that only users who previously unlocked old cycles on SimBrief will be able to access them.
FeatureAdded code to enable the use of AIRAC cycles that are older than the default cycle. Release pending Navigraph approval.
Bug FixFixed a bug in the route database script that could cause the OFP process to fail.
FeatureAdded new aircraft profiles: A359, A35K.
FeatureAdded NOTAM filtering logic to remove certain "QOBCE" and "OBST ..." NOTAMS from the OFP, in line with real world briefing packages.
Bug FixFixed an SSL bug that was preventing NAT Tracks from being updated.
Bug FixFixed an issue with the METAR/TAF fetching script caused by a new SSL redirect.
FeatureAdded support for degrees, minutes, and seconds when entering Lat/Long coordinates in the route string.
FeatureAdded new detailed profiles: MD82, MD83.
Bug FixFixed a bug that could produce faulty ETOPS calculations when a custom destination alternate was selected that was not part of SimBrief's default suitable airports list.
FeatureThe route analyzer now advises if the chosen SID/STAR is invalid for the selected runway, and a button is provided to fix the error if desired.
UpdateUpdated formats with new alternate parameters: RYR, ETD.
FeatureAdded 15 second caching of frontpage statistics to reduce database load.
UpdateOptimized "requests" table queries.
FeatureAdded advanced alternate features to the API.
FeatureAdded new FMS Download: vPilot.
FeatureAdded new FMS Download: Aerowinx PSX 747.
FeatureAdded new <fms_downloads> section to the API XML file. Files within this section are labelled based on their format id (<crx>, <pmr>, etc.) making it easier to find specific formats when reading the XML data.
FeatureAdded new FMS Download: UFMC - Universal FMC.
FeatureAdded additional Fuel Factor values to the Fleet section.
FeatureAdded the ability to delete multiple saved flights at once.
Bug FixFixed SIGWX parser error that occurred when min + max icing altitudes were undefined.
ChangeRemoved SID, STAR, runways, and alternate routing from the FlightFactor A320U format due to frequent import errors.
FeatureAdded FIR avoidance capability to the Route Finder tool.
FeatureAdded ATC Callsign parameter to the API XML file, accessible through atc->callsign.
UpdateTweaked fuel calculations for the A320 series when cruising at greater than M78.
Bug FixCorrected FSLabs Uplink files to always use KGs.
FeatureAdded code to prevent excessively long historical routes from being suggested.
FeatureAdded Black Box Airbus format to the FMS Downloads list (FS9 alias).
FeatureAdded FlightFactor format to the FMS Downloads list (Aerosoft Airbus alias).
UpdateUpdated FMS Downloads to HTML5 standards. Right-click -> Save As should work now.
FeatureAdded install instructions to the FMS Downloads list.
FeatureAdded new FMS Download: FSLabs A320.
FeatureAdded new FMS Format: FlightFactor A320.
UpdateUpdated aircraft profile: MD88.
Bug FixFixed a bug that could return outdated FlightAware routes.
FeatureAdded userid indexes to "flights" and "fleets" databases (increased speed for these sections).
UpdateRedesigned server back-up script.
Bug FixFixed a bug that could cause div/0 errors following the new manoeuvring corrections.
UpdateFurther improvements to departure/arrival maneuvering time, fuel, and distance.
UpdateReserve fuel calculation improved.
Bug FixFixed a bug which could cause faulty fuel requirements for legacy aircraft profiles.
Bug FixFixed erroneous frequency display on some ETOPS Navlog waypoints.
ChangeNavlog distance to first/last waypoint now reflects maneuvering distance.
ChangeContingency fuel 1-minute increments are now based on actual average fuel flow.
FeatureAdded support for multiple (up to 4) alternates.
FeatureAdded support for custom alternate routings.
FeatureAdded advanced alternate settings to the Dispatch Options page in support of the new features.
FeatureAdded Takeoff Alternate weather and NOTAMs to the LIDO format where applicable.
UpdateModified the default LIDO format to support multiple alternate routings, NOTAMs, and weather.
Bug FixFixed a bug which could cause a higher than optimal altitude to be selected on short legs.
Bug FixFixed the MXSHR display on the LIDO format on flights with no shears above 0.
Bug FixCorrected IMT figures on navlog to use current waypoint MagVar.
FeatureAdded taxi times to the "Saved Selections" function.
UpdateUpdated Shear function with a more accurate formula.
Bug FixCorrected ETOPS Critical Point calculation. The Navlog's EFOB and MFOB at the exit point are no longer considered.
Bug FixCorrected the Max Oceanic Entry figure that appears on some OFP formats.
UpdateImproved Optimum altitude selection when entering/exiting oceanic airspace.
UpdateUpdated the following aircraft profiles with new altitude data: A318, A319, A320, A332, A333, A321, B733, B737, B738, B74F, B763, B76F, B772, B77L, B77F, B77W.
UpdateVarious other updates to the following aircraft profiles: A333, B77L, B77F, B77W.
UpdateReprogrammed Optimum/Maximum altitude function to support chart data. For supported aircraft profiles, the Optimum and Maximum altitudes will now be calculated with greater precision.
UpdateUpdated the following aircraft profiles with new Opt/Max altitude charts: B744.
Bug FixFixed a minor bug with the optimum altitude selection.
FeatureAdded additional Fuel Factors to the drop down list (up to ± 80%).
UpdateUpdated timezone functions to use 3 possible data sources, depending on availability.
Bug FixFixed an error which caused SimBrief to disregard airway restrictions on short routes.
Bug FixFixed faulty FPLs being sent to CFMU Validator in some cases.
ChangeOn the Options page, entering a manual cruising altitude will now automatically uncheck the Stepclimbs option, while checking the Stepclimbs option will now clear any entered cruising altitude. Flashing icons highlight these automatic selections to alert the user.
FeatureAdded support for IATA codes on the Dispatch Options page. Airports can now be typed in using their 3-letter IATA or 4-letter ICAO codes.
FeatureAdded additional contingency fuel options with support for percentage, minutes, and the greater of a percentage/minutes value.
UpdateUpdated all OFP layouts to better depict the contingency mode used.
FeatureAdded new FMS format: Leonardo MD80.
UpdateUpdated DAL layout.
Bug FixVarious minor bug fixes affecting cruise fuel flow.
FeatureAdded new FMS format: IXEG 737 Classic.
UpdateUpdated JarDesign FMS format with better handling of NAT Tracks and Directs.
FeatureAdded new FMS format: FS Commander.
FeatureAdded new FMS format: vasFMC.
FeatureAdded new FMS format: Google Earth KML.
FeatureAdded new FMS format: FeelThere.
FeatureAdded new FMS format: Flight1 GTN 650/750.
FeatureAdded new FMS format: Project Magenta.
FeatureAdded NAT Track support to SkyVector link.
UpdateModified back-end code to make it easier to add new FMS formats.
Bug FixVarious minor bug fixes.
Bug FixFixed a bug which produced invalid forum passwords when a user's main site password included the "&" symbol.
Bug FixCorrected fuel depiction for flights exceeding max aircraft range. EXTRA fuel now shows the fuel shortage as a negative value (instead of CONT fuel).
Bug FixFixed a bug where some flights exceeding max range would require additional ETOPS fuel.
ChangeEXTRA fuel is now trimmed to match max fuel capacity. Selecting EXTRA fuel above what can be boarded on the aircraft will result in automatically reducing that fuel until max capacity.
FeatureAdded new aircraft profiles: PC12, EA50.
Bug FixFixed ETOPS bug which caused airports with certain weather strings in their TAF to return a 0/0 forecast.
FeatureAdded new Downloadable FMS Format: Aerosoft CRJ.
Bug FixRebuilt fresh NOTAMs database using current AIDAP NOTAMs.
Bug FixFixed a bug which could cause some NOTAMs to not show up.
FeatureAdded more specific pop-up information when FMS Downloads are disabled due to a DCT route.
FeatureAdded additional Reserve options (35 and 40 min).
FeatureAdded the ability to reactivate a session without having to refresh the Dispatch Options page.
ChangeThe interactive route map on the Output page is now hidden by default. It can be viewed by clicking on the provided placeholder.
ChangeThe Password Reset tool now only requires that you provide your account's e-mail address.
FeatureAdded new aircraft profile: CL30.
Bug FixFixed a fuel flow bug that occurred at very low levels on certain aircraft.
FeatureRoute parser now accepts flight level changes without a specified speed (i.e. both ABC/N0450F350 and ABC/F350 are now accepted).
ChangeReduced low-level departure and arrival fuel padding for all types (to better match real world OFPs).
FeatureAdded new "My Flights" section and functions.
FeatureAdded new "My Fleet" section and functions.
FeatureAdded Cost Index support, only available on some aircraft profiles.
FeatureAdded ETOPS calculations for 3 conditions: DX, DC, 1X.
UpdateImplemented new detailed aircraft profiles: A318,A319,A320,A321,B738,B772,B77L,B77F,B77W.
UpdateImplemented flight level optimization.
UpdateImproved ETOPS alternate selection. Alternates are now better positioned relative to the route.
ChangeWind barbs on UAD charts are now placed at fixed intervals, rather than fixed lat/long coordinates.
FeatureAdded new OFP format: SWA (Southwest Airlines).
UpdateUpdated B736-B739 altitude profiles.
UpdateTweaked climb and descent time/distance/fuel formulas.
ChangeIncreased fuel allowance for approaches.
UpdateImproved TOC and TOD calculations.
UpdateImproved fuel flow calculations versus ISA deviation.
UpdateUpdated DH8D profile.
FeatureAdded new aircraft types: L101 (L1011-500), E13L (EMB-135 BJ).
UpdateTweaked optimum altitude for B77L, B77F, and B77W.
FeatureAdded new aircraft type: BE20.
Bug FixFixed a bug that occurred when manually forcing a VERY low altitude (<2000ft).
UpdateUpdated Interactive Route Map to use Canvas for displaying wind barbs (performance improvement).
FeatureAdded required framework for the future SimBrief API.
UpdateImproved Alternate selection.
Bug FixFixed an issue with the average winds used on non-navlog OFPs.
FeatureAdded new OFP format: JetBlue Airways (JBU).
UpdateReorganized the aircraft database, no impact on the end user yet, but in the future this may enable users to add their own aircraft profiles.
ChangeRe-enabled the "Runway Analysis" (TLR) option. As of now, this function is only used in the JZA and JBU formats.
ChangeThere are now 3 Flight Map options: Detailed, Simple, and None.
FeatureAdded new OFP format: US Airways (AWE).
FeatureAdded new OFP format: American Airlines (AAL).
FeatureAdded the average route wind direction and speed to the UAL F:WZ and AFR flightplan formats.
FeatureAdded waypoint wind information to the UAL F:WZ weather section.
UpdateReorganized the UAL F:WZ fuel section to more accurately reflect the non-Redispatch layout.
UpdateUpdated alternate airport and ETOPS airport database.
UpdateUpdated B752,B763,E135,E145 fuel profiles.
FeatureAdded new OFP format: United Airlines F:WZ (UAL F:WZ).
FeatureAdded new code to cache METARs and TAFs locally, this should speed up flight plan generating by 5-10 seconds (or more), depending on the complexity of the flight.
Bug FixFixed a bug which was preventing AIRAC 1113 users from seeing some map overlays (Airports, VORs, NDBs, Intersections, and Airways).
FeatureAdded new OFP format: Jazz Aviation (JZA).
FeatureAdded several new overlays to the Interactive Route Map: Airports, VORs, NDBs, Intersections, and Airways.
FeatureAdded a new "Donate" button to the top of the website.
FeatureAdded Interactive Route Map to the Dispatch Options page to aid in flight planning.
FeatureAdded a new "Analyze Route" function to the Dispatch Options page, to be used in conjunction with the Route Map to visually inspect routes.
FeatureAdded new OFP format: Air Berlin (BER).
FeatureAdded new Dispatch Output feature: Interactive Route Map.
UpdateUpdated B77L max passengers to 314.
UpdateUpdated B77W max passengers to 386.
UpdateUpdated B788 fuel profile.
FeatureAdded new aircraft types: RJ1H,RJ85,RJ70.
UpdateUpdated A319 max passengers to 142.
UpdateUpdated B763 max passengers to 264.
FeatureAdded new aircraft type: H25B (Hawker 800).
UpdateImproved alternate selection, fixed a bug that would occur when few alternate airports were available.
Bug FixFixed a bug that would produce an erroneous Extra Fuel time with ETOPS selected and units set to KG.
FeatureAdded new aircraft type: C750.
FeatureAdded new downloadable flightplan format: FSX.
FeatureAdded a temporary system lockout when server winds are being synchronized. Every 6 hours for a period of about 60 seconds the system will block any flightplan requests with an error message indicating how many seconds remain until the system reopens. This avoids unnecessary wind fetch errors while the winds are synchronizing.
FeatureAdded a new map projection to better represent polar routes.
ChangeRenamed "FS2004/FSX" format to "FS9".
FeatureAdded new downloadable flightplan format: iFly.
Bug FixFixed a bug in the PMDG .rte format related to via airways.
FeatureAdded 2% Contingency Fuel option.
FeatureAdded new aircraft types: B76F and B75F.
FeatureAdded a new "Detailed Maps" option. This option makes use of a new custom built script to generate SIGWX and Wind maps. As this is a major system change, there may be a few bugs with it initially.
UpdateIntroduced new wind fetch method, wind fetches should now be quicker.
Bug FixFixed a bug which would give an invalid altitude on short legs where the "Scheduled Time Enroute" and "Navlog" options were not specified/selected.
FeatureAdded new OFP format: AFR.
FeatureAdded new downloadable format: Wilco Airbus Evolution.
FeatureAdded new OFP format: DLH.
FeatureAdded new OFP format alias: ACA.
FeatureAdded new PDF template, applied only to the DLH format so far.
FeatureAdded new option for 3% Cont Fuel.
FeatureAdded ETP point display on route maps.
UpdateImproved "Print OFP" page breaks.
FeatureAdded new flight plan downloads: Airbus Extended, IVAO/IVAP, Level-D 767, QualityWings.
FeatureMajor improvement to units detection code. Previously the flight plan units would sometimes switch 1 fix too late or 1 fix too early, this has been resolved.
ChangeRemoved the "Runway Analysis" option from the Dispatch Options page as it is not used at the moment.
FeatureAdded new OFP Layout: UAE (Emirates LIDO format).
FeatureAdded new aircraft types: MD82, MD83, MD88, MD90.
UpdateImproved units detection code.
UpdateTweaked performance figures for the B712.
UpdateApplied improved page breaks and line spacing to LIDO format.
Bug FixFixed a bug with the "WEIGHT CHANGE" section in BA formats.
FeatureAdded the ability for the system to correctly identify fixes defined by a radial and distance from a waypoint or NDB. Previously, this only worked for VORs.
Bug FixCorrected a minor bug when setting Extra Fuel in KG.
Bug FixFixed bugs in the UAL format: RMNG WGT figure not correct, FUEL TEMP figure not correct on long legs.
FeatureAdded new OFP Layout: UAL (United Airlines).
UpdateTweaked ETOPS fuel calculations.
FeatureAdded the option to download a PMDG FMS (.rte) file for the generated route.
FeatureAdded the option to download a PMDG WX (.wx) file for the generated route.
FeatureAdded new OFP Layout: DAL (Delta Air Lines).
UpdateVery minor tweaks to the B703 Fuel and Altitude data.
FeatureAdded new OFP Layout: BAW (British Airways CIRRUS format).
FeatureAdded new aircraft types: BBJ1, BBJ2, BBJ3.
UpdateTweaked B738, B739 fuel profiles.
FeatureAdded new aircraft types: E170, E195.
UpdateUpdated E175 and E190 profiles.
FeatureAdded the ability to plan NAIFR (No Alternate IFR) by typing "NONE" in the alternate box on the dispatch options page.
FeatureAdded the option to download an X-Plane format flightplan.
UpdateTweaked fuel burns for: B737,B739.
FeatureAdded new aircraft type: B703.
FeatureAdded new dispatch options: Cont Fuel Percentage and Reserve Rule.
UpdateImproved wind fetching, wind failures should be much less common now.
UpdateTweaked fuel burns for DH8A/B/C/D, CRJ2/7/9.
Bug FixCorrected TOC and TOD distances for prop aircraft.
FeatureAdded new aircraft type: A310.
Bug FixFixed a bug which could occur when specifying altitudes less than 10000ft.
Bug FixFixed the units definition for Russian FIRs. Altitudes are now displayed in feet rather than meters for the applicable FIRs.
Bug FixFixed a minor bug in the climb and descent winds.
Bug FixFixed a minor bug in the MORA calculation.
Bug FixCorrected the aircraft code for freighter aircraft in the ICAO FLIGHT PLAN section (B74F => B744, MD1F => MD11, B77F => B77L).
FeatureAdded a "Delete This Flight" option to the Dispatch History section. Users may now use this button to remove flights from the Dispatch History list.
FeatureAdded "CLIMB" and "DESCENT" wind information to the wind summary section.
FeatureAdded the following new aircraft: B747F, MD11F, B777F.
UpdateReprogrammed the MORA calculation to use actual terrain data. MORAs should be more accurate now.
UpdateTweaked units detection along the route of flight. More work is still needed.
Bug FixFixed a bug which could cause the departure and arrival airport FIR NOTAMs to not be displayed.
- Major Update -
FeatureAdded code to recognize malformed SIDs and STARs in the route (ex. typing REDFA6T instead of REDF6T).
FeatureMAJOR UPDATE: The various units and flight levels unique to certain parts of the world are now taken into account. For example, Russia now uses KPH and Meters, and China now uses it's own metric flight levels. Some errors may occur over the coming days as I refine this feature.
FeatureAdded new aircraft type: C510.
UpdateUpdated FIR database to more accurately reflect the current real world FIR map.
UpdateAircraft altitude is now taken into account when tracking FIR boundary crossings.
UpdateTweaked aircraft performance for B77W,B77L,B772,B744.
UpdateImproved the login procedure for the website. Some users may have experienced random logouts while using the site, this should be fixed now.
ChangeChanged the logic for the CONT fuel calculation. CONT fuel is now equal to either 5% of the predicted burn, or 12 minutes at normal cruise. Whichever is higher.
FeatureAdded "Clear Data" button the Dispatch Options page.
Bug FixFixed a bug which could cause a "Database Error" on flight plans which took over 3 minutes to generate.
Bug FixFixed a major bug which would throw all sorts of errors if a Top of Climb or Top of Descent point was located close to 180 degrees west/east.
FeatureAdded new Dispatch Option: Zero Fuel Weight. This allows users to manually override the ZFW calculated by the system.
FeatureAdded new Dispatch Option: Extra Fuel. This allows users to add fuel on top of the fuel load the system calculates.
FeatureAdded new Dispatch Option: Fuel Factor. This acts as a fuel burn multiplier.
ChangeFlights over the Atlantic now file airspeeds in Mach when in MNPS airspace.
UpdateContinued updating the fuel profiles for some aircraft. About 50% of the aircraft database has been updated now.
Bug FixFixed a bug where, if the same waypoint appeared twice in a given route, the ETOPS portion may fail.
Bug FixFixed a bug which occurred if the system found an intersection with the same ident as the departure airport (ex. UUDD).
Bug FixFixed a bug which occurred when a selected airport's runways are missing from the database.
Bug FixFixed numerous bugs which occurred when entering the following route format: "(0.0nm) SID > AKBUK (18.5nm) UG80 > OKESA (27.0nm) UG80 > IMR (72.0nm) UG80 > BERGO (113.4nm) UG80 > DUGLA (143.7nm) UG80 > KONEN (162.6nm) UG80 > BIG (191.3nm) STAR > (269.3nm)". I have no idea what format this is or where it comes from, but the system should accept it now.
Bug FixFixed a bug which caused the custom altitude option to be ignored if the "Plan Stepclimbs" option was selected.
UpdateUpdated the fuel burn for several aircraft, including the B736-B739, all B777 variants, and the A320 series.
Bug FixFixed a bug in the fuel flow calculation that could produce erroneous fuel burns for certain aircraft.
Bug FixFixed a bug which produced an erroneous Top of Climb point if the user specified a custom altitude in the format "FL350", rather than the preferred format "35000".
Bug FixFixed various other minor bugs which surfaced during the first day of public use.
FeatureAdded the following new aircraft types: A345, B748, B764, B788.
UpdateFurther tweaks to the performance figures of some aircraft types.
FeatureAdded the following new aircraft types: A306, A346, B733, B734, B735, CRJ7, DC10, E135.
UpdateTweaked performance figures for numerous other aircraft types.
FeatureAdded NAT Track altitude constraints. Step climbs are now planned with reference to the available flight levels for the filed NAT Track.
Bug FixFixed a bug on routes between airports which are not ETOPS suitable and are thus located in ETOPS airspace.
FeatureAdded inclusion of NAT Track NOTAMs on Oceanic flight plans.
FeatureAdded depiction of NAT Tracks on the Route Map for Oceanic flight plans.
FeatureAdded visual depiction of Entry and Exit points on the Route Map for ETOPS flight plans.
Bug FixFixed an error which occurred on flight plans containing only 1 waypoint, should that waypoint be invalid or not found.
Bug FixFixed a bug on routes containing the same airway twice. If one instance of the airway used invalid endpoints, every instance of the airway would be removed rather than just the invalid instance.
UpdateTweaked the Operational Impacts section and the weight change impacts.
Bug FixFixed a minor bug with the ETOPS planning which could produce an out-of-range ETOPS alternate under specific conditions.
FeatureAdded new OFP section "Operational Impacts". This section displays the fuel cost and time difference of speed, altitude, and weight changes from the planned values.
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