| Category code | Explanation | 
| J | Regular flight (Scheduled flight) | 
| C | Non regular flight (Charter flight) | 
| T1 | First visit (Type) | 
| AT1 | First visit (Company type) | 
| R1 | First visit (Registration) | 
| L | Last flight / Departure | 
| P | Delivery / Ferry flight | 
| S | Sanitary / Ambulance flight | 
| MP | Military (Fuel stop / Ferry flight) | 
| M1 | Military (First visit) | 
| V | VIP flights / Government types | 
| EJ | Emergency / Diversion (Regular type) | 
| E1 | Emergency / Diversion (First visit) | 
| O | Other |