At a Glance

More than 525 Southwest Air Lines flights were delayed Monday morning.The FAA said five airlines were having trouble with a flight planning weight and balance program called Aerodata. Delta, JetBlue, United and Alaska Airlines were also affected, according to the FAA.

Southwest and Delta are among at least five major airlines reporting systemwide computer outages Monday morning that delayed hundreds of flights.

Southwest Airlines and Delta Air Lines first reported the problems on Twitter.

“It's affecting our flights system wide, and we're working to see if it's affecting any other carriers this morning as well,” Southwest wrote in one of hundreds of responses to upset travelers. “In the meantime, once more information has been made available our Agents at the airport will be happy to disseminate it to y'all.”

"We are currently experiencing a System-Wide Outage we are working diligently to get it back up and running," Delta said.

More than have been delayed as of 8 a.m. Monday, according to flightaware.com. The other four affected airlines had more than 175 flights delayed.

The FAA told Fox News in a statement "with a flight planning weight and balance program called Aerodata. Mainline operations and regional operations are impacted to varying degrees."

The agency said United, JetBlue and Alaska Airlines were also affected.

About 7:15 a.m., Southwest tweeted that the issue had been resolved.