NIC 51—Air Transport

Where 51 sits

1. H Transportation and storage
2. 51 Air Transport

Contains 2 narrower codes

• 511 Passenger air transport
• 512 Freight air transport

What 51 includes

• This division includes transportation of passengers or freight by air or via space

What 51 excludes

• Crop spraying, see 0161
• Repair and maintenance of aircraft or aircraft engines, see 3315
• Operation of airports, see 5223
• Aerial advertising (sky-writing), see 7310
• Aerial photography, see 7420
• Civil aerial surveillance, see 8019
• Military aerial surveillance, see 8422

51 in other systems