Keyword ability. A unit with Airborne may fly while on the surface. It gains three benefits while on the surface: When taking a step, it may move diagonally. It cannot be targeted by attacks, unless the attacking unit also has Airborne. It cannot be intercepted, unless the intercepting unit has Airborne or Ranged. Important reminders: Attacks from Airborne units can be defended normally! Airborne is mostly a defensive ability and gives greater mobility, but Airborne attacks (against a unit or a site) can be defended by any unit, even without Airborne! The Airborne unit must swoop down to attack. Even if an Airborne attacker targets an Airborne defender, a non-Airborne unit may defend, since the original target can bring the fight down to the ground. Airborne only works on the surface. If the unit starts its step on the surface of a site, it can step diagonally. If the unit starts its step in a different region (void, underwater, underground), then it can't step diagonally (and also doesn't get the other benefits either). Airborne has no effect on counting distance for effects with 'up to X steps away,' e.g. Disenchant.