American Airlines - 9/11 "didn't happen" :)

WikiScanner discovered that American Airlines changed their Wikipedia entry to state that Flights 11 and 77 never flew on 9/11.
Original entry was:

Two American Airlines aircraft were hijacked and crashed during the September 11, 2001 Terrorist Attack: American Airlines Flight 77 (a Boeing 757) and American Airlines Flight 11 (a Boeing 767).

New entry is:

Two American Airlines aircraft were hijacked and crashed during the September 11, 2001 Terrorist Attack: Flight 77 (a Boeing 757) and Flight 11 (a Boeing 767). Although these flights were daily departures before and a month after September 11, 2001. Neither flight 11 nor 77 were scheduled on September 11, 2001. The records kept by the Bureau of Transportation Statistics (www.bts.gov/gis/) do not list either flight that day.

A Google search of the IP address that made the change - 144.9.8.21 - is located at American Airlines.
Why the change American airlines? Did the flights actually operate or did we just imagine all of that?

From http://www.dailykos.com/storyonly/2007/8/25/92620/6237