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не миль/час? 400км для такого самолёта исключительно мало, а 400 миль это как раз около 800км

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Reached cruise altitude of FL380 (approximately 38,000 ft.) roughly 27 minutes after takeoff at 10:27 am local time. Cruise ground speed of 476 kt., similar to previous day’s flight. Source: Flightradar24.com
Began a descent from cruise altitude without clearance and with no communications from the crew to air traffic control at approximately 10:31 am local time. Transponder code throughout the flight remained on the initial assigned code of 5512 (the emergency code is 7700). Source: Germanwings press conference, Flightradar24.com, FlightAware.com
Descent continued relatively straight ahead for approximately 9 minutes at vertical descent rates from 2,000 – 5,000 feet per minute. Ground speed varied between 490 kt. and 378 kt. at time of last ADS-B signal received. Source: Flightradar.com
Last position picked up by a Flightradar24 ground ADS-B receiver at approximately 10:40 am local and 6,800 ft. altitude, either due to crash or loss of signal at the receiver site. Source: Flightradar.com
Lufthansa’s last fatal accident involved another one of its Airbus A320s registered as D-AIPN. The aircraft overshot the runway upon landing at Warsaw’s Chopin International Airport on September 14, 1993. Two people on board died.