According to the airlines and to the Federal Aviation Administration, the problem has been resolved and flights have resumed with some delays.
The outage was due to a technical issue with a program called AeroData, according to a statement from the FAA. The third-party contractor measures weight and balance to determine whether flights can take off, according to ABC News.
AeroData is currently experiencing a technical issue that is impacting multiple carriers. We appreciate your patience during the wait.— American Airlines (@AmericanAir) April 1, 2019
The FAA wrote that JetBlue and Alaska were also among the airlines affected. It's unknown how many flights were impacted.
On Twitter, the FAA reminded passengers to contact their airlines with any issues.
#Traveler Alert✈️: Several U.S. #airlines are experiencing computer issues this morning. Please contact your airline directly for flight information and updates. The #FAA does not cancel flights. #FlySmart pic.twitter.com/5x4U3f6ogu— The FAA (@FAANews) April 1, 2019
The airlines were replying to people flying out of multiple airports who said their flights had been affected asking for patience.
I completely apologize, we are currently experiencing a System-Wide Outage we are working diligently to get it back up and running. We do not have a specific time as yet. TMC— Delta (@Delta) April 1, 2019
It's affecting our flights system wide, and we're working to see if it's affecting any other carriers this morning as well. In the meantime, once more information has been made available our Agents at the airport will be happy to disseminate it to y'all. -Rocky— Southwest Airlines (@SouthwestAir) April 1, 2019
It appears that we are experiencing an outage that is impacting our ability to create release paperwork, Katie. We know this is frustrating, and we will get you in the air as quickly as possible. ^CM— United Airlines (@united) April 1, 2019
Southwest sent ABC the following statement:
"As of 6:05am CDT, Southwest Airlines has lifted an internal ground stop implemented for about 40 minutes this morning during an outage with a vendor that services multiple carriers with data used in flight planning. Scattered flight delays are anticipated and Customers should check Southwest.com for the latest updates on specific flights. We're working with Customers on any impacts to their travel plans and we appreciate their understanding as we place nothing higher than the safe operation of every flight."