All 19 hijackers boarded the planes on the morning of September 11, having carefully chosen flights whose routes would be transcontinental. Two planes flew out of Boston's Logan Airport, one flew from Washington's Dulles International Airport, and the fourth left an airport in Newark, New Jersey. | All 19 hijackers boarded the planes on the morning of September 11, having carefully chosen flights whose routes would be transcontinental. Two planes flew out of Boston's Logan Airport, one flew from Washington's Dulles International Airport, and the fourth left an airport in Newark, New Jersey. |