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
$AllAirBridgeCrossingUnits$