From the Dallas Morning News Aviation Blog:
http://aviationblog.dallasnews.com/
"A two-month-old Boeing 737-800 owned by American Airlines left Victorville, Calif., at 3:49 a.m. PST Thursday and headed to Dallas/Fort Worth International Airport. The significance: People tell us it had been repainted in American’s new livery.
We don’t know what it looks like. We’ll know later on Thursday morning when American rolls the new paint job out for public viewing.
American Flight 9634 departed Victorville is supposed to arrive at Dallas/Fort Worth International Airport around 8:15 a.m. or 8:30 a.m.. CST. It’s to be parked at American’s hangar on the east side of the airport until the new paint job is revealed."