In all the valuable research that has been conducted into 9/11, a significant detail has so far been mostly overlooked: An examination of news reports and other accounts reveals that a surprising proportion of the people on the four targeted planes had only been booked onto those flights at the last minute, often the day before or even the morning of September 11. Pilots on three of the four planes, more than half of all the flight attendants, and many passengers--including almost half those on Flight 93--were not originally booked to be on those flights.
It is difficult to dismiss all this evidence as mere coincidence. There must be specific reasons that we do not yet know about. For the truth to be uncovered will require further study by independent researchers, scrutiny by the press, and proper formal investigations of the 9/11 attacks.
Below is a summary of these latecomers to the four planes: American Airlines Flights 11 and 77, and United Airlines Flights 175 and 93.