Yes, the Boeing 747–400 is a fly-by-wire airliner.
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First developed on military aircraft and on Concorde, fly-by-wire technology has equipped all Airbus aircraft including A220 since the first A320, back in 1988 and the most modern version of concurrent aircraft, such as the B777, B787 and Embraer E-jets.
However, the 737 MAX extended spoilers are fly-by-wire controlled. Most of the systems are carried from the 737NG to allow for a short differences-training course to upgrade flight crews. In addition to the Speed Trim System (STS), the automatic stabilizer control system has been enhanced to include MCAS.
Commonly referred to as the 'Triple Seven,' the 777 is Boeing's first fly-by-wire airliner (an electronic system that replaces the conventional manual flight controls of an aircraft) and the first commercial aircraft entirely computer-designed.
No. Fly-by-wire implies and denotes complete disconnection from the mechanical systems in the cockpit. The pilots fly the computers and the computers fly the airplane. The 737 is, really, the only airliner in current manufacture that does not feature fly-by-wire, although in the case of the 747–8, it is partial.
Built in 1967 to produce the mammoth jet, it remains the world's largest manufacturing plant according to Boeing. But after five decades, customer demand for the 747 eroded as Boeing and Airbus (AIR.PA) developed more fuel efficient two-engine widebody planes.
Former United CEO Oscar Munoz shared precisely why his company decided to retire the jet. He explained that it had started to become a struggle to maintain. Ultimately, the age of the type has reduced its efficiency across the board.
“If you could book a 737 500, and you find out it's a 737 MAX, technically they don't have to honor your request. … So you don't have a right to specify you are not going to go on a 737 MAX.”