Major airlines in the U.S. reported systemwide outages Monday due to what the Federal Aviation Administration called an issue "with a flight planning weight and balance program called Aerodata."

The list of airlines experiencing problems included Southwest Airlines  (LUV) - Get Report , Delta Air Lines (DAL) - Get Report , United Continental (UAL) - Get Report , JetBlue (JBLU) - Get Report and Alaska Airlines (ALK) - Get Report .

Southwest Airlines' Twitter account has been busy Monday assuring stranded passengers that the company is "working hard to get back to full functionality."

Meanwhile, American Airlines (AAL) - Get Report , the country's largest carrier, said that while its main operations remained unaffected by the outages, regional carriers nationwide were feeling the effects. 

The FAA issued a statement at around 8:30 AM saying that the issue has been fixed. 

Southwest Airlines shares are up 0.56%, Delta Airlines was gaining 0.2%, JetBlue was up 1%, United was up 0.5%, American Airlines was rising 1.13% and Alaska Air was up 1.16%. 

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