- Hangars and other aircraft storage facilities (1)
- Hangar operation (2)
- Aircraft maintenance and repair services (11)
- Aircraft cleaning and janitorial service (1)
- Aircraft servicing and repairing (19)
- Aircraft upholstery repair (1)
- Airport (20)
- Military flying field (1)
- Air freight handling at airports (2)
- Airport control tower operation, except government (1)
- Airport leasing, if operating airport (1)
- Airport terminal services (3)
- Fixed base operator (2)
