Question id 8 - Operational Procedures - ATPL - Airline Transport Pilot license

Return to the flight plan route if it is different from the last oceanic clearance received and acknowledged.
Join one of the so-called 'special' routes.
Continue the flight in compliance with the last oceanic clearance received and acknowledged.
Change the flight level in accordance with predetermined instructions.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license