More than a thousand flights were already canceled on Monday morning as the Federal Aviation Administration continued its order to cut 4% of air traffic at dozens of airports.

According to FlightAware, there have been nearly 1,600 flights canceled within, into, or out of the U.S., with 1,955 delays.

Here is the breakdown by airline:

• Southwest: 271 cancellations, 245 delays
• Delta Air Lines: 263 cancellations, 151 delays
• American Airlines: 102 cancellations, 100 delays
• United: 86 cancellations, 122 delays
• JetBlue: 50 cancellations, 150 delays
• Spirit: 17 cancellations, 40 delays
• Frontier: 13 cancellations, 33 delays

Here is the breakdown of airports that were told to cut service:

• Hartsfield-Jackson (ATL) 5% canceled, 3% delayed
• Boston (BOS): 5% canceled, 7% delayed
• Orlando (MCO): 4% canceled, 8% delayed
• Charlotte/Douglas (CLT): 2% canceled, 1% delayed

Despite the deal to reopen the government passing the first hurdle, there were air traffic control staffing problems on Monday morning. Dallas Fort Worth International had to issue a ground stop, and won’t have the normal slate of controllers until 2 p.m. ET, CNN reported.

Chicago’s O’Hare International Airport is in a similar situation, with full staffing expected at 3 p.m. ET while it also deals with a snowstorm.

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