Originally Posted by
rickair7777
If you were arrested, but not convicted, that will not show up on any of the "normal" checks.
However...airlines may ask if you were ever arrested for anything, and in that case you should probably be honest. Trespassing is pretty minor and if it gets thrown out, that's even better. It would be possible for an airline to learn of an incident like that if they conduct a private background check in addition to pulling the national records. I suspect AA/eagle would do that, not too sure of any others.
Arrests do show up on the FBI fingerprint-based check and on the private background checks that most airlines will run. A pending misdemeanor trespassing
probably wan't adversely impact you, but get it resolved if you can.