[2022] Wrong Vehicles from Bus Depots

Those aren't vehicles that exist in the vanilla game, so my guess is they are custom assets made as buses so you can create bus lines in the airport to have them moving around.

You can use the vehicle selection for the lines to set a specific bus to spawn, or you can use a mod like Advanced Vehicle Options to stop those "buses" from spawning when they aren't specifically assigned to a line. Or you can of course unsubscribe them if you don't want to use them.