Boeing 737-400 Classic Airliner Variant

The Boeing 737-400 was the largest passenger member of the 737 Classic series, extending the single-aisle family for short- to medium-range markets. Boeing grouped the 737-300, -400, and -500 as the Classic generation; later freighter conversions preserved the -400 airframe for cargo service. Boeing's planning dimensions are 36.40 m overall length and 28.88 m span for the illustrated airframe without winglets. The listed 68,039 kg MTOW is the 150,000 lb takeoff-weight option with CFM56-3B2 or CFM56-3C engines; lower weight options also exist. Passenger capacity here is the manual's 146-seat two-class layout, rather than the exit limit or a particular airline cabin.