AAI

AAI may refer to:

Business

 * AAI Corporation, a United States defense company
 * Adam Aircraft Industries, a United States company
 * Ahrens Aircraft Inc, an aircraft manufacturer established at Oxnard, California
 * American Athletic Inc., an athletic apparel brand owned by Fruit of the Loom
 * Arlington Asset Investment, a real estate investment trust headquartered in Arlington, Virginia
 * AutoAlliance International, a joint-venture automobile assembly firm co-owned by Ford and Mazda
 * Aviation Industries Ilyushin, a Russian company

Non-profit organizations

 * Adım Adım Initiative, a volunteer-based social initiative in Turkey that promotes charitable giving
 * Africa-America Institute, an international organization dedicated to increasing educational opportunity for young Africans and improving global understanding of Africa
 * AIESEC Alumni International, an international project of association for former volunteer members, executive boards, international trainees or staff of AIESEC
 * Airline Ambassadors International, a non-profit organization
 * American Antitrust Institute, an independent Washington-based non-profit education, research, and advocacy organization
 * American Association of Immunologists, a non-profit organization dedicated to advancing the field of immunology
 * Arab American Institute, a non-profit organization based in Washington D.C. that focuses on the issues and interests of Arab-Americans nationwide
 * Architectural Association of Ireland, an organisation dedicated to architecture
 * Asian Arts Initiative, a non-profit organization in Philadelphia
 * Atheist Alliance International, a global network of atheist organizations around the world

Education

 * Alliance Academy International, an international school following an American curriculum in Quito, Ecuador
 * Andreyev Acoustics Institute, a Russian research facility dedicated to the study of acoustics
 * Africa-America Institute, CIA run education organisation

Technology

 * AAI, IATA airport code for Arraias Airport in Arraias, Tocantins, Brazil
 * AAI Sparrowhawk, an American two seat pusher ultralight autogyro, available in kit form for amateur construction
 * AAI Corporation Aerosonde, a small unmanned aerial vehicle (UAV) designed to collect weather data over oceans and remote areas
 * AAI underwater revolver, an amphibious firearm intended for naval use
 * Authentication and authorization infrastructure, access-control for network content

Science

 * Alpha amylase inhibitor, a group of proteins that blocks the Enzyme Alpha-Amylase
 * AAI mode of an artificial pacemaker: Atrial chamber paced, Atrial chamber sensed, and Inhibiting response to sensing
 * Atlantoaxial instability, caused by laxity of the transverse ligament of atlas, a ligament which arches across the ring of the atlas (the topmost cervical vertebra, which directly supports the skull)

Entertainment

 * Aai (film), an Indian Tamil language film starring R. Sarath Kumar, Namitha Kapoor, Vadivelu, Kalabhavan Mani
 * AAI (album), 2021 album by Mouse on Mars
 * Ace Attorney Investigations: Miles Edgeworth, a 2009 spin-off video game that's part of the Ace Attorney series

Sports

 * Associação Atlética Iguaçu, a Brazilian football team from the city of União da Vitória, Paraná state
 * Athletics Ireland (Athletics Association of Ireland), governing body for athletics in Ireland

Other uses

 * Adrenaline autoinjector, a medical device for injecting a measured dose or doses of epinephrine (adrenaline)
 * Arifama-Miniafia language, a language of Papua New Guinea
 * Adult Attachment Interview, a method used in attachment theory
 * Airports Authority of India, a wing of the ministry of aviation in India
 * Automatic Accounting Instructions, programming used by Oracle JD Edwards EnterpriseOne to determine how to distribute amounts associated with journal entries that the system generates.
 * The Aai, a group of Ancient Egyptian deities