American Airlines Flight 11
Also called: AA11, Flight 11
On 11 September 2001 a Boston–Los Angeles airliner that left at 7:59 a.m. was hijacked and flown into the north tower of the World Trade Center in New York at 8:46.

Carol M. Highsmith · Public domain · Source
The Boeing 767 carried 87 crew and passengers — and five hijackers. About fifteen minutes after take-off five hijackers seized the cockpit; with its transponder off, the plane turned south near Albany, New York, and followed the Hudson River down.
Flight attendants Betty Ong and Amy Sweeney used the cabin phones to report the hijacking and the hijackers’ seat numbers. At 8:46 a.m. the plane struck floors 93–99 of the north tower. At first many people thought it was an accident involving a small plane.