If you're using GSX jetways, make sure you update to version 2.7.8:
GSX Pro FIX: Message reporting Jetway not close enough, resulting in invisible passengers.
GSX Pro FIX: Change to better handle the SU13 Jetway Navdata changes and error handling, which would cause missing vehicles after landing.
GSX (all versions) NEW: Added the following Handling operators: Surair, Transport Limited (Suriname).
FSDT Installer: Better error handling to prevent crashes due to bad downloads.