Everything is up to date(drivers, GSX,...)
Be sure you have the latest FULL installer or the latest Vehicles update installed.
If you are sure you have, and this is happening only on some airports, it's possible you have a problem with the FSX settings so, try all of these:
- Update your video driver
- Reset your video driver settings to default
- Reset the FSX settings to default, by removing the following file:
%APPDATA%\Microsoft\FSX\FSX.CFG
This will force FSX to rebuild a new config with all default settings.