A scheduled power outage at Philadelphia International Airport led to the problems after computers didn't reboot properly but systems were back online by 8 a.m.
The pilots' union president said Thursday that American Airlines is reducing its safety margin by "manipulating" flight plans with tactics that include faster speeds.
Don't expect ample legroom or free checked bags. But fliers will find improved snacks, a larger selection of free movies and -- on a few select routes -- the return of free meals.