In the ATC flight plan item 15, it is necessary to enter any point at which a change of cruising speed takes place. For this purpose a 'change of speed' is defined as:
Domanda 90, Flight Planning and Monitoring - ATPL - Airline Transport Pilot license
| 20 km per hour or 0.1 Mach or more |
| 10 % TAS or 0.05 Mach or more |
| 20 knots or 0.05 Mach or more |
| 5% TAS or 0.01 Mach or more |
