37210 - Aircraft (Miscellaneous)
37211 - Military aircraft
3721121 - - Fixed wing aircraft, Powered + Adjustable wing & Foldable wing aircraft
3721123 - - Rotary wing aircraft, Powered (Helicopters, Autogiros)
3721128 - - Gliders, Balloons & other Aircraft (General)
3721199 - - Complete aircraft, Military type (Miscellaneous)
37215 - Civilian aircraft
3721501 - - Complete civil aircraft, Unladen weight <= 2000 kg (4409 lb) Single engine
3721503 - - Complete civil aircraft, Unladen weight <= 2000 kg (4409 lb) Multiengine
3721505 - - Complete civil aircraft, Unladen weight > 2000 kg (4405 lb) - 15000 kg (33040 lb)
3721507 - - Complete civil aircraft, Unladen weight > 15000 kg (33040 lb)
3721511 - - Civilian aircraft: Fixed wing, Single engine
3721512 - - Civilian aircraft: Fixed wing, Multiengine
3721518 - - Civilian aircraft: Rotary wing (Helicopter, Autogiros)
3721520 - - Civilian aircraft: other Aircraft
3721532 - - Complete civil helicopters (Rotary wing, Powered) Unladen weight <= 2000 kg (4405 lb)
3721534 - - Complete civil helicopters (Rotary wing, Powered) Unladen weight > 2000 kg (4405 lb)
3721535 - - Complete civil balloons, Dirigibles & Airships (Nonpowered) & Kits
3721537 - - Complete civil gliders & Sailplanes (Nonpowered) & Kits
3721539 - - Other Complete civil aircraft, incl Aircraft sold in kits (except hang gliders)
37217 - Modification, Conversion & Overhaul of Previously accepted aircraft
3721711 - - Modification for Military aircraft & all other Aircraft built to military specifications
3721751 - - Modification for Civilian customers
3721799 - - Modification, Conversion & Overhaul of Previously accepted aircraft (Miscellaneous)
37218 - Aeronautical services on complete aircraft
3721813 - - Aeronautical services for Military customers: Research & Development on complete aircraft
3721815 - - Aeronautical services for Military customers: all other Aeronautical services on complete aircraft
3721853 - - Aeronautical services for Civilian customers: Research & Development on complete aircraft
3721855 - - Aeronautical services for Civilian customers: all other Aeronautical services on complete aircraft
3721899 - - Aeronautical services on complete aircraft (Miscellaneous)
3721XX0 - - Aircraft (Miscellaneous - Volume)
3721XX2 - - Aircraft (Miscellaneous - Speciality)