The longer-range twin-engine A330 and four-engine A340 have conventional winglets, as do Boeing 747-400s ... from wing to winglet that is characteristic of the company's design.

In the early 1960s, engineers from Boeing and Pan Am began working on the preliminary design of the 747. In 1965 ... including wing fluttering and engine nacelle issues. The program's cost ...

The airline patched a fifth engine onto the wing of the Boeing 747-400 jumbo jet. The engine was destined for another aircraft that became stranded after experiencing mechanical trouble.