Which Boeing aircraft family first flew on April 9, 1967?

The Boeing 737 is the aircraft family that first flew on April 9, 1967.

The prototype, a 737-100, made its first flight from Boeing Field in Seattle. Lufthansa became the launch customer, and the first 737 entered airline service in February 1968. The design was intended as a smaller companion to Boeing’s 727, with two engines mounted beneath the wings.

The 737 became one of the world’s most widely used commercial aircraft families. Its major generations include the Original, Classic, Next Generation, and 737 MAX series. The 737-100 and 737-200 were the original variants, while the 737-800 became one of the most common versions.

The 737 is sometimes confused with the larger 727 because both were Boeing short-haul jets from the same era. Unlike the three-engine 727, the 737 has two engines.