Organizations
- AAI Corporation, a United States company
- Adam Aircraft Industries, a United States company
- Aiesec Alumni International, a global association of former volunteer members, executive boards, international trainees or Staff of AIESEC
- Alliance Academy International, an international school following an American curriculum in Quito, Ecuador
- American Antitrust Institute, an independent Washington-based non-profit education, research, and advocacy organization
- 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
- Asia America Initiative, a non-profit non-governmental organization
- AutoAlliance International, a joint-venture automobile assembly firm co-owned by Ford and Mazda
- Atheist Alliance International, a global network of atheist organizations around the world
- Aviation Industries Ilyushin, a Russian company
- Adım Adım Initiative, a volunteer-based social initiative in Turkey that promotes charitable giving
- Ahrens Aircraft Inc, an aircraft manufacturer established at Oxnard, California
- Airline Ambassadors International, a non-profit organization
- Andreyev Acoustics Institute, a Russian research facility dedicated to the study of acoustics
- Arlington Asset Investment, a real estate investment trust headquartered in Arlington, Virginia
- Asian Arts Initiative, a non-profit organization in Philadelphia
- Associação Atlética Iguaçu, a Brazilian football team from the city of União da Vitória, Paraná state
- Airports Authority of India, a wing of the ministry of aviation in India
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