In Aeronautics
- .aero, the internet top-level domain
- Aeroplane
- Aerospace engineering or more specifically aerodynamics
- Aero Contractors (Nigeria), a scheduled airline from Nigeria
- Aero Contractors (US), private charter company based in Smithfield, North Carolina, said to provide discreet air transport services for the Central Intelligence Agency.
- Aero, a United States aircraft manufacturer, later became Aero Design and Engineering Company, and later the Aero Commander division of Rockwell International.
- Aero (Polish airline), a Polish airline founded in 1925 which later was merged into LOT
- Aero Ltd, a Polish aircraft company
- Aéropostale (aviation), a French aviation company
- Aero Vodochody, a Czech aircraft company
- Aero Airlines, an Estonian airline owned by Finnair
- Aero O/Y, the name of Finnair until 1953.
- Aeroflot - Russian Airlines
- Aero makes up the first part of many Latin American airlines including:
- Aeroperú (literally translated as Air Peru)
- Aeroméxico
- Aerocondor
- Aero Condor Peru
- Aerolíneas Argentinas
- Aeropostal Alas de Venezuela, an airline based in Caracas in Venezuela
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