Did you know there were other would-be hijackers that planned to take over flights on 9/11 but could not complete their mission because their planes were grounded.
This History Chanel program discusses how a flight was grounded and the would-be hijackers fled the plane. Authorities found al-Qaeda material in their luggage.
http://www.thehistorychannel.co.uk/site/tv...gramme_2998.phpThere were to be more than four hijacked planes on 9/11.