Question 26 - Operational Procedures - ATPL - Airline Transport Pilot license

A permanent 60 NM minimum between all NAT HLA approved aircraft.
A permanent 90 NM minimum between all aircraft in the NAT region.
The aircraft's selected Mach number only.
The applicable route structure, surveillance/communication capability and navigation performance requirements.

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