The letter 'L' is written in the wake turbulence box of a flight plan form when the maximum certified take-off weight of an aircraft is less than or equal to:
Domanda 299, Air Law - ATPL - Airline Transport Pilot license
| 14 000 kg. |
| 7 000 kg. |
| 5 700 kg for aeroplanes and 2 700 kg for helicopters. |
| 20 000 kg. |
