Learn why FSX AI aircraft disappear and restore default or add-on traffic by checking sliders, traffic BGLs, models and core game files.
AI aircraft usually go missing in FSX or FSX: Steam Edition because both traffic sliders are at zero, the default traffic BGL has been disabled, required models were removed, or a legacy add-on BGL is suppressing FSX schedules. Check those items first; use Steam verification or boxed-edition repair only for missing stock files.
How do I tell what is actually missing?
AI traffic requires both a scheduled flight in a traffic BGL and a working aircraft model. The symptom usually identifies which part has failed.
| Symptom | Likely cause |
|---|---|
| No airline or general aviation traffic anywhere | Traffic sliders, disabled traffic BGL, inactive scenery area or incompatible legacy BGL |
| Add-on traffic appears but default aircraft do not | trafficAircraft.bgl was removed or deliberately disabled |
| Default traffic appears but an add-on airline does not | Missing package flight plans, models, liveries or incorrect aircraft.cfg titles |
| Labels, lights or shadows appear without an aircraft body | Missing model or texture files, or broken configuration references |
| Traffic appears at some airports only | Flight schedules, parking availability or airport parking codes rather than missing files |
What should I check before repairing FSX?
- Raise both AI traffic sliders. Under FSX display traffic settings, set Airline traffic density and General aviation traffic density above zero. Reload the flight after changing them.
- Test at a suitable airport and time. Use a large default airport during daytime. A small airfield, an add-on airport without suitable parking, or a quiet point in the schedule can make a working installation look empty.
- Inspect the default traffic file. The stock schedule is normally
[FSX]\Scenery\World\Scenery\trafficAircraft.bgl. If its extension was changed to.off,.bakor something similar, an AI package installer may have disabled it deliberately. - Check the scenery area. The default scenery entry pointing to
Scenery\Worldmust remain active. Traffic BGLs placed in other scenery folders also require an active Scenery Library entry. - Confirm that aircraft models exist. Stock and many add-on AI models reside under
[FSX]\SimObjects\Airplanes. The activefsx.cfgshould include the standardSimObjectPaths.0=SimObjects\Airplanesentry. - Isolate recently installed traffic files. An FS2004-format traffic BGL in an active scenery folder can suppress FSX-format schedules. Temporarily rename suspect third-party traffic BGLs one at a time, restart FSX and retest. Our full AI traffic troubleshooting checklist covers format conflicts, airport parking and rendering faults in more detail.
How do I restore the default FSX AI aircraft?
Restore stock AI files through the installation method for your edition rather than downloading isolated system files from an unknown build.
- Back up modified content. Close FSX and copy any customised files from
SimObjects\AirplanesandScenery\World\Scenery. Pay particular attention to altered stock aircraft and traffic files. - Repair FSX: Steam Edition. In Steam, open the simulator's properties, select the installed-files section and verify the integrity of the game files. Steam should replace missing or altered stock files, including default aircraft components and the original traffic BGL.
- Repair boxed FSX. Run setup from the original installation media and use its repair option if offered. If a full reinstall is necessary, preserve add-ons first and reinstall the base simulator and any service packs or Acceleration components in their proper order.
- Retest with stock content. Confirm that
trafficAircraft.bgland the default aircraft folders are present, raise the traffic sliders, then load a busy default airport.
Should I re-enable trafficAircraft.bgl manually?
Re-enable it only when you want the original generic FSX schedules. Many airline traffic packages rename this file intentionally so their real-world schedules are not mixed with default traffic.
If the file merely has a disabled extension, renaming it back to trafficAircraft.bgl is enough; no repair is required. Avoid leaving duplicate active copies of the same schedule because that can produce duplicate flights and excess traffic.
Will Steam verification remove my add-ons?
Verification normally leaves additional third-party files alone, but it can replace anything that modified a stock file. It also cannot restore deleted freeware packages, custom flight plans or liveries, so retain a backup before running it.
How do I restore missing add-on AI airlines?
An add-on airline needs three matching parts: an installed aircraft model and livery, an exact title= entry in aircraft.cfg, and a compiled traffic BGL whose flight plan calls that title. Replacing only the schedule will not restore a deleted model.
- Reinstall the complete package into the correct FSX or Steam Edition root. For older airline packages, use the World of AI package installer for FSX rather than copying only the traffic BGL.
- Restore its aircraft and schedules together. Our collection of World of AI aircraft and flight-plan packages provides the associated models, liveries and schedules.
- Check the destination. A common mistake is installing into an old boxed-FSX folder when Steam Edition is the copy actually being run. Verify the simulator root selected by the installer.
- Preserve aircraft.cfg titles. Changing or deleting a livery's
title=value breaks any flight plan compiled against that exact name.
Why can I see AI labels but not the aircraft?
Visible labels, lights or moving shadows prove that FSX has loaded the traffic schedule, so repairing the traffic BGL will not help. The fault is normally a missing model, texture folder or configuration reference; follow our model-and-texture checks for invisible FSX aircraft before reinstalling every traffic package.