On December 15, 1944, Miller, now a major, was scheduled to fly from the United Kingdom to Paris to play for the soldiers who had recently liberated Paris. His plane departed from RAF Twinwood Farm, Clapham, Bedfordshire, but disappeared over the English Channel and was never found. Miller's disappearance remains a mystery; neither his remains nor the wreckage of his plane (a single-engined Noorduyn Norseman UC-64, USAAF Tail Number 44-70285) were ever recovered from the water. (Clive Ward's discovery of a Noorduyn Norseman off the coast of Northern France in 1985 was unverifiable and contained no human remains.)
There have been sixty years of theories about what happened to Glenn Miller. Buddy DeFranco, one of the leaders of the post war Glenn Miller orchestra explained to George Simon, that at many of the concerts where he was leading the Glenn Miller band in the 1970s, more than a few people confided to him what "really" happened to Glenn Miller. "If I were to believe all those stories, there would have been about twelve thousand four hundred and fifty eight people there at the field in England seeing him off on that last flight!"
It is now thought more than likely that Glenn Miller's plane was accidentally bombed by RAF bombers over The English Channel, after an abortive air raid on Germany and short on fuel dumping four thousand pounds of bombs in a safe drop zone to lighten the load. The logbooks of Royal Air Force pilot Fred Shaw record that a small mono engined plane was seen to spiral out of control and crash into the water.