Boeing 747

A 747-100B version, which has a stronger airframe and undercarriage design as well as an increased maximum takeoff weight (MTOW) of 750,000 lb (340,000 kg) was offered. The 747-100B was delivered only to Iran Air and Saudia (now Saudi Arabian Airlines). Optional engine models were offered by Rolls-Royce (RB211) and GE (CF6), but only Saudia ordered the Rolls-Royce option.