Aviation
- NAC Air, a former Native owned air carrier, Canada
- National Air Communications, a British government organisation 1939-1940
- National Airways Corporation, the former national domestic airline of New Zealand
- Nauru Air Corporation, the national airline of the Pacific island Republic of Nauru
- Naval Aircrewman, United States Navy staff having undergone naval aircraft training
- Nepal Airlines Corporation, national flag carrier of Nepal
- Northern Air Cargo, a cargo airline based in Anchorage, Alaska, USA
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