U.S. airlines started returning to full service Monday morning after a disruption of data they needed for takeoff caused delays across the country.

The issue involved weight and balance information provided by AeroData Inc. that is needed for flight planning, the agency said in a statement. The interruption lasted for about 48 minutes starting at 5:24 a.m. in Washington, the FAA said. Mainline and regional carriers were affected to varying degrees.

The intermittent problem lasted about two hours, according to American Airlines Group Inc., which experienced delays at some of its regional affiliates. Delta Air Lines Inc., Southwest Airlines Co. and United Continental Holdings Inc. also were affected. Delta also said that only its regional flights were affected.

United said 150 flights by its United Express regional carriers were delayed. “Some flights that were affected have departed, and we’re working to get all affected flights back on schedule,” the carrier said in a statement. Delta said it didn’t expect any cancellations among the Delta Express flights delayed by the outage.

Detroit Metropolitan Airport was experiencing arrival delays an average of 31 minutes, according to flight-tracking service FlightAware early Monday morning. The airport showed 56 delays and one cancellation between 6-10 a.m, FlightAware showed.

Airport officials said they had no additional information on the disruption.