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The Boeing 747-400 and the Boeing 747-8 are still being made but the Boeing 747-100, -200 and -300 have been discontinued.
Boeing 747-8
The most popular model, the Boeing 747-400 and the Boeing 747-8 can go at 988km/h
The length of a Boeing 747-8 in feet is 250 ft 2 in
Yes. Yes they are.