A U.S. Air Force fighter plane with one pilot on board crashed into the North Sea on Monday. The status of the pilot wasn’t known.The F-15C Eagle from the 48th Fighter Wing was on a routine training mission from RAF Lakenheath when it crashed at 9:40 a.m. local time (4:40 a.m. EDT). The cause of the crash wasn’t immediately clear. U.K. search and rescue authorities