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41 - ATPL - During a flight over the sea at FL 100 from Marseille (QNH 1016 hPa) to Palma de Mallorca (QNH 1016 hPa), the true altitude is constantly decreasing. What is the probable reason for this?

Question 41 - Meteorology - ATPL - Airline Transport Pilot license

The altimeter is faulty
One of the QNH values must be wrong
The air at Palma de Mallorca is warmer than that at Marseille
The air at Marseille is warmer than that at Palma de Mallorca

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