- Hangars and other aircraft storage facilities (1)
- Aircraft storage at airports (2)
- Airport hangar rental (6)
- Hangar operation (2)
- Aircraft maintenance and repair services (41)
- Aircraft cleaning and janitorial service (9)
- Aircraft servicing and repairing (26)
- Airports and flying fields (2)
- Airport (39)
- Flying field, except those maintained by clubs (1)
- Military flying field (1)
- Air freight handling at airports (5)
- Airport control tower operation, except government (1)
- Airport leasing, if operating airport (1)
- Airport terminal services (3)
- Fixed base operator (1)
