According to TO page 297 (no idea what page it is in the new two-volume TO),
Airborne units that employ a Booby Trap inflict no damage to other units unless another airborne unit is in the same hex on the Low Altitude map (or, if a non-aerospace airborne unit, within 3 hexes and elevations of the exploding Booby Trapped unit). In such an event, the other airborne unit must make a Control Roll/Piloting Skill Roll when the Booby Trap explodes.
Definitions of "ground unit" and "aerospace unit" appear on page 20 of TW. Since aerospace units include conventional fighters, fixed-wing support aircraft, and airships, I can only assume that "non-aerospace airborne unit" must refer to VTOLs and WiGEs. If so, that last quoted sentence about the "other airborne unit" suggests that a VTOL/WiGE with a booby trap can only damage other airborne units unless it lands.
So, can an airborne VTOL or WiGE with a booby trap damage a unit that is physically touching the ground without having to land first?
