It is yet unknown how this ray-shaped Alien Aircraft is capable of hovering above ground, emitting light and generating high-voltage electricity beams, however, their seemingly intelligent behavior and quick reactions suggest that these alien flying machines are in fact living beings with a somewhat sophisticated predator-like intelligence.

These aliens are capable of reaching the speed of a military fighter jet, evidenced by the shock waves created as they zoom past In addition, the Alien Aircraft are capable of generating an orange beam of energy from their similarly colored underside, most notably seen in the beginning of Opposing Force, where several crafts take down US Ospreys Goose 7 and 3 using the same beam. The bright orange underside of a single-tailed Alien Aircraft. The outer hides of both are impervious to damage even from the RPG. The other, which is encountered in all Half-Life games, has a cleft head and two tails.

One type, encountered in the first map of the Half-Life chapter Interloper, has a pointed head and a single tail.

Half life 2 dropship