Sorry I've looked it up and it appears I was mistaken about the source of the infamous 1947 crash. The OXCART project did operate out of Area 51 though, and the

Sorry I've looked it up and it appears I was mistaken about the source of the infamous 1947 crash. The OXCART project did operate out of Area 51 though, and there were a number of crashes and cover ups - they were working on spy planes after all!