United Airlines apologized on Wednesday for inadvertently reactivating the retired flight numbers of its two planes that crashed after being hijacked by terrorists on Sept. 11, 2001.
The flight numbers were assigned by a computer late Monday for sales of future flights, said airline spokesman Rahsaan Johnson. Early Wednesday, airline officials noticed the error and immediately removed them from the system.
"We did not make a decision to use those flight numbers," Johnson said. "The error was technical."
Although not required by the Federal Aviation Administration, airlines typically retire the numbers of flights involved in fatal crashes, an FAA spokeswoman said.
United Flight 93 was hijacked while en route to San Francisco from Newark, N.J., and crashed near Shanksville, Pa., killing all 44 people aboard. United Flight 175, traveling from Boston to Los Angeles, was hijacked and crashed into the south tower of the World Trade Center in New York with 65 people aboard.