Question: When en route from China to France, must pilots know their altitude in the imperial foot?, Answer:Yes, Description of Foot (unit): customary unit of length, Fact1: Most international airports and aviators use the foot to measure altitude , Fact2: China and North Korea require pilots to use meters for altitude, Fact3: Pilots must communicate their altitude with local air traffic control 
Step1: Which unit of altitude does France require pilots to use?, Step2: Which unit of altitude does China require pilots to use?, Step3: Is #1 or #2 the imperial foot?, Wikipedia page for step 1: Aviation in France, Wikipedia page for step 2: Aviation in China, Wikipedia page for step 3: , not_definitive_answer: False, incorrect_answer: False