The question "Which airline has 4 engines?" is incomplete. A more precise question would be: "Which aircraft has 4 engines and is flown by airlines?". Based on the provided reference, the answer is:
The Boeing 747 is a large, wide-body airliner that uses four wing-mounted engines. Many airlines have flown the Boeing 747.
The reference describes the Boeing 747, stating that it is a large, wide-body airliner equipped with four engines. The reference provides this information:
- The Boeing 747 is a large, wide-body airliner.
- It has four wing-mounted engines.
- Its wings have a high sweep angle of 37.5° for an efficient cruise.
- The cruise speed is Mach 0.84 to 0.88, depending on the variant.
Therefore, since the Boeing 747 is the aircraft with 4 engines and many airlines have flown it, the Boeing 747 would be the answer.
