Ballista-Shot Catapult-Shot Trebuchet-Shot Bombard-Shot Mortar-Shot Scorpid-Shot Fire-Shot Dynamite Owl-Form Air-Balloon Gryphon-Transport Airship Flying-Machine Gunship Gyrocopter Hippogryph Wind-Rider Zeppelin Gargoyles or just use the variable name $AllAirBridgeCrossingUnits$