What is the Boeing 747-400?
Q: What is the Boeing 747-400?
A: The Boeing 747-400 is a variant of the Boeing 747, which is a jet airliner.
Q: What are some improvements of the 747-400 compared to the original 747?
A: The 747-400 features more powerful engines, new avionics, a new interior, and a longer-span wing with winglets.
Q: When did the 747-400 first fly?
A: The 747-400 first flew in 1988.
Q: when did it enter service?
A: The 747-400 entered service in 1989.
Q: How long was the 747-400 produced?
A: The 747-400 was produced until 2009.
Q: How many variants of the 747-400 were there?
A: There were six different variants of the 747-400: 747-400, 747-400F, 747-400M, 747-400D, 747-400ER, and 747-400ERF.
Q: What are winglets?
A: Winglets are vertical extensions at the tip of the aircraft wing, designed to reduce drag and increase efficiency.
