Premise: American Airlines . It is the world 's largest airline when measured by fleet size , revenue , scheduled passenger-kilometres flown , and number of destinations served . American Airlines Flight 11 was a domestic passenger flight that was hijacked by five al-Qaeda members on September 11 , 2001 , as part of the September 11 attacks . American Airlines Flight 77 was a scheduled American Airlines domestic transcontinental passenger flight from Washington Dulles International Airport in Dulles , Virginia , to Los Angeles International Airport in Los Angeles , California . September 11 attacks . Two of the planes , American Airlines Flight 11 and United Airlines Flight 175 , were crashed into the North and South towers , respectively , of the World Trade Center complex in New York City .
Hypothesis: The September 11 attacks involved passenger airplanes.
Label: ENTAILMENT