| 488190 |
Aircraft testing services |
| 488190 |
Airport passenger screening security services |
| 488190 |
Fueling aircraft on a contract or fee basis |
| 488190 |
Independent pilot, air (except owner-operators) |
| 488190 |
Inspection services, aircraft |
| 488190 |
Maintenance and repair services, aircraft (except factory conversion, factory overhaul, factory rebuilding) |
| 488190 |
Testing services, aircraft |
| 488210 |
Freight car cleaning services |
| 488210 |
Grain leveling and trimming in railroad cars |
| 488210 |
Loading and unloading services at rail terminals |