AAI Corporation is an aerospace and defense development and manufacturing firm, located in Hunt Valley, Maryland, US.

AAI's products and services include unmanned aircraft and ground control technologies; training and simulation systems; automated aerospace test and maintenance equipment; armament systems; and logistical, engineering, supply chain and operational support services, multi-turreted tracked ground combat vehicles.

The joint venture, named Electric Transit, Inc., supplied 330 trolley buses to San Francisco and Dayton before being dissolved in 2004.

[3] Today, AAI owns or occupies more than 1,100,000 square feet (100,000 m2) of office and manufacturing space across Australia, the United Kingdom and the USA.

[4] AAI is one of a limited number of companies engaged in the design and full-rate production of a successfully fielded, operational unmanned aircraft system (UAS) for the DoD.

AAI first began development work on the unmanned systems product line in 1985, winning a competitive fly-off with its Pioneer Remotely Piloted Vehicle.

On 16 November 2009, AAI entered a 40-year exclusive license agreement with Carter Aviation Technologies concerning a possible autonomous slowed rotor/compound aircraft with potential for increased speed (250 knots) and range (1300 nautical miles) delivering 3000 pounds cargo, compared to traditional rotorcraft.

[13][14][15] In March 2019, the U.S. Army selected Martin UAV and AAI Corporation to "provide unmanned aircraft systems for platoons to try out as candidates to replace the Shadow tactical UAS."

[16] AAI provides a variety of engineering, logistical, maintenance, repair and overhaul services for the company's own platforms as well as those of other original equipment manufacturers.

Its customers include the U.S. Army, Air Force, Navy and Marine Corps, for which the company supports a wide variety of operational systems.

AAI has capabilities in the design, production, and sustainment of maintenance training devices such as the C-17 Globemaster, the F-22 Raptor, and most recently, the F-35 Lightning II Joint Strike Fighter.

The F-35 Lightning II aircraft system maintenance trainer provides student maintainers comprehensive training on ground operation, maintenance, fault isolation, and testing procedures in a highly realistic simulated environment utilizing an interactive 3-D virtual aircraft environment.