(film) For adults only

(military) Airman third class

(military) Skyhawk single engine attack aircraft. / (military) Air material and supply officer. / (military) Material and supply section of an Air Force staff.

(military) The planning section of an Air Force staff. / (military) Vigilante supersonic attack aircraft.

plural of A-106

(medicine) A protein from patients with Alzheimer's

(aviation) The Agusta A.106 prototype helicopter, which never made it into pre-production.

plural of A-109

(aviation) The Agusta A109 twin-engine utility helicopter.

(medicine) Arterial to alveolar oxygen ratio.