Transportation
- Air One, is an airline based in Rome, Italy, with an IATA code of AP
- Atlantic and Pacific Railroad, a subsidiary of the Santa Fe Railway
- Autopilot, automatic or assisted vehicle piloting
- Airframe and Powerplant, a certificate issued by the US Federal Aviation Administration for aircraft maintenance technicians
- Automotive Products, a former UK automotive components company
- A&P Group, a ship repair and conversion company, formerly Austin & Pickersgill
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