CHARLOTTE, N.C. -- Some American Airline passengers are still stuck at Charlotte-Douglas International Airport after five days.

• It will be several days before service returns back to normal
• Industry experts say the problems are due to aging infrastructure
• Some passengers say they will never fly American Airlines again           

Flights continually canceled with no real idea of when people will make it to their destinations. To say it's been a frustrating time for American passengers is an understatement.

Though systems are back online, it's not yet known the full impact of the crippling glitch at PSA Airlines, American's largest regional carrier.

It will be several days before stranded passengers will see service return to normal.

“They booked me on a flight for this morning and they canceled that one, and they got me a flight for this afternoon, and they canceled that one,” one passenger said.

All due to a PSA Airlines computer software issue that slowed getting flight crews to the right planes.

It’s an occurrence University of North Carolina Charlotte professor and airline industry expert Dr. Peter Schwarz says is happening more frequently.

“A number of airlines have experienced problems due to aging infrastructure,” he said.

Just this past December, Delta suffered a five-hour computer outage that resulted in $150 million in losses and forced the cancellation of 2,000 flights.

“It's going to be a very costly event,” he said. “It's American's name that's on the outside of the planes and it's a wholly-owned subsidiary of American Airlines.”

Its officials, Schwarz says, will demand answers from PSA on what led to a reported 25,000 flight cancellations before repairs were even made with the bulk of those at Charlotte-Douglas.

“This is very poor for American Airlines and I will never fly with them again, never over Charlotte,” another passenger said.

Overcoming the damage done to its most valuable asset may the hardest of all.