Gander Crash
No one will ever know but it did happen and a lot of Troopers lost their lives. And after the incident there was a huge clamp down on using contracted aircraft to move troops in and out of operational areas by the US Military.
The point I am making is the RAF have a very good record concidering the amount of hours flown and the age of the aircraft and that as been sorted with dedicated RAF Personnel whom whatever the trade have flight safety first and formost.