Embraer EMB-145EU, G-EMBE and two McDonnell Douglas F15E Eagle Aircraft
The aircraft commander reported seeing an F15E fast jet pass close in front of his aircraft whilst his aircraft was cruising on Airway P155 at FL210. The ‘intruder’ aircraft was later identified as one of a pair of fighter aircraft diverting from RAF Lakenheath to RAF Valley. The military aircraft were both low on fuel and were diverting due to poor weather and resultant air traffic delays at Lakenheath. They had climbed above their cleared level and one aircraft passed within 0.53 nm of the aircraft on the airway. It has not been possible to determine the vertical separation.