211 - ATPL - An aircraft is flying over the sea at FL 90; the true altitude is 9100 feet; local QNH is unknown. What assumption, if any, can be made about the air mass in which the aircraft is flying?
Question 211 - Meteorology - ATPL - Airline Transport Pilot license
There is insufficient information to make any assumption
Its average temperature is the same as ISA
It is warmer than ISA
It is colder than ISA
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