It seems to me that if there was a plane crash there would have been a fair amount of fire and burnt tress and fields and so forth from jet fuel ignited fires. But there should have been virtually the entire air craft to recover... and bodies and lugguge... that is.. what didn't burn up... and bones don't burn either. So all the bones of all on board should have been (could have been) recovered.
While there may have been some bits and pieces... it seems as if the vast majority of the plane and contents (if it was flight 93) just disappeared... or of it did crash... was recovered and hidden.
You can recall when flight 008 went down just South of Montauk in over 100 feet depth.. almost the entire plane was recovered and re constructed. With flight 93 we were told it buried itself in the ground. Ha???????????? why didn't they dig it up? Let's see the plane!
Look Boss da plane.. da plane!