World Boeing 737-800, a Precursor to the 737 Max, Is Used Widely. December 29, 2024Niraj Chokshi and River Akira DavisComments Off on Boeing 737-800, a Precursor to the 737 Max, Is Used Widely. Nearly 200 airlines use the 737-800, which makes up about 15 percent of the world’s fleet of aircraft.