FILE - A Southwest Airlines jet passes unused luggage carts as it arrives, Dec. 28, 2022, at Sky Harbor International Airport in Phoenix. (AP Photo / Matt York, File)

Southwest canceled about 16,700 flights over the last 10 days of December. The U.S. Department of Transportation is investigating whether the airline deceived customers by knowingly scheduling more flights than it realistically could handle.

A Southwest Airlines passenger jet approaches Kansas City International Airport to land as geese fly overhead, Friday, Dec. 30, 2022, in Kansas City, Mo. A computer outage at the Federal Aviation Administration brought flights to a standstill across the U.S. on Wednesday, with hundreds of delays quickly cascading through the system at airports nationwide. (AP Photo / Charlie Riedel, File)

The Federal Aviation Administration is lifting a ground stop on flights across the U.S. following a computer outage early Wednesday that resulted in thousands of delays and hundreds of cancellations quickly cascading through the system at airports nationwide.

A Southwest Airlines ground operations crew member waits to guide an arriving jet into a gate, Wednesday, Dec. 28, 2022, at Sky Harbor International Airport in Phoenix. (AP Photo / Matt York)

Southwest Airlines returned to a relatively normal flight schedule Friday, as the focus shifts to making things right with what could be well more than a million passengers who missed family connections or flights home during the holidays, and many of whom are still missing luggage.

Ashlyn Harmon of New Orleans searches for her Southwest Airlines bags amongst hundreds of others at Midway International Airport as Southwest continues to cancel thousands of flights across the country Wednesday, Dec. 28, 2022, in Chicago. Harmon said her family’s initial Southwest flight was cancelled on Christmas so they rebooked on American Airlines, although Southwest still shipped their bags to Midway. “We rebooked ourselves,” she said. “I figure we can deal with refunds and all of that when we get bac

It is likely that far more than 1 million passengers have been affected. Southwest has canceled more than 13,000 flights since its meltdown began on Dec. 22. Its planes have 143 to 175 seats and were likely nearly fully booked around the Christmas and New Year’s holidays.

Passengers wearing masks walk through the Capital airport terminal in Beijing on Dec. 13, 2022. (AP Photo / Ng Han Guan, File)

The increase in cases across China follows the rollback of the nation’s strict anti-virus controls. China’s “zero COVID” policies had kept the country’s infection rate low but fueled public frustration and crushed economic growth.

A traveler wades through the field of unclaimed bags at the Southwest Airlines luggage carousels at Denver International Airport, Tuesday, Dec. 27, 2022, in Denver. (AP Photo / David Zalubowski)

This week, with cancellations from other major airlines ranging from none to 2%, Southwest has canceled nearly 10,000 flights as of Wednesday and warned of thousands more Thursday and Friday, according to FlightAware.

Baggage waits to be claimed after canceled flights at the Southwest Airlines terminal at Los Angeles International Airport on Monday, Dec. 26, 2022, in Los Angeles. (Eugene Garcia / AP)

Airports most affected by the Tuesday cancellations are Denver International, followed by Chicago Midway International, Baltimore/Washington International, Harry Reid International Airport in Las Vegas, Dallas Love Field and Nashville International.

More than 1,000 flights have been cancelled across the United States, according to the flight tracking site FlightAware, as severe winter weather threatens holiday travel, and pictured, Alaska Airlines planes in Seattle, Washington, on Dec. 20. (David Ryder / Bloomberg / Getty Images)

More than 1,800 flights have been canceled Thursday across the United States, according to the flight tracking site FlightAware, as severe winter weather complicates holiday travel.

Travelers walk through Terminal 3 at O'Hare International Airport in Chicago. (Nam Y. Huh / AP)

The number of travelers expected to fly – 7.2 million – is just shy of 2019’s 7.3 million. And when you factor in that airlines are operating fewer flights that are more crowded, there’s serious potential for a serious mess for air travelers. How to cope? Here are some strategies.

A United Airlines jetliner taxis for take off from Denver International Airport, Thursday, May 26, 2022, in Denver.  (AP Photo/David Zalubowski, File)

United said Wednesday that it will resume seasonal flights from Newark, New Jersey, to Stockholm, which it dropped in 2019, and launch new summer service from Newark to Malaga, Spain.

Travelers wait for their flight at Los Angeles International Airport. According to the flight tracking website, FlightAware, there have been 200 flights canceled so far on Aug. 8. On Aug. 7, 950 flights were canceled. (Michael Ho Wai Lee / SOPA Images / Sipa)(Michael Ho Wai Lee / SOPA Images / Sipa)

On Sunday, Chicago O’Hare saw the most cancellations and delays, with approximately 12% of flights canceled, and over 45% of flights delayed.

Midway Airport (WTTW News)

U.S. airlines have canceled more than 100,000 flights this year, with 30,000 cancellations just since Memorial Day weekend, according to data from flight tracking site FlightAware.

Airline passengers arrive at Chicago's Midway International Airport on the first day of the July 4th holiday weekend Friday, July 1, 2022, in Chicago. (AP Photo / Charles Rex Arbogast)

AAA predicts that nearly 48 million people will travel at least 50 miles or more from home over the weekend, slightly fewer than in 2019. AAA says car travel will set a record even with the national average price for gasoline hovering near $5.

An Amtrak train which derailed after striking a dump truck is seen beyond a corn field Monday, June 27, 2022, near Mendon, Mo. (AP Photo/Charlie Riedel)
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The first lawsuits have been filed only days after an Amtrak train collision and derailment in rural Missouri that left four people dead and injured up to 150 others.

An image taken from a video posted by Robert Nightingale, who was a passenger aboard the Amtrak train that derailed on Monday, June 27, 2022, in Mendon, Missouri. (Credit: Robert Nightingale via CNN)

Three people are dead and at least 50 injured after an Amtrak train derailed Monday in Missouri, Cpl. Justin Dunn, a spokesperson for Missouri State Highway Patrol Troop B, told reporters Monday evening.

Passengers get a COVID-19 test at Heathrow Airport in London, Nov. 29, 2021. (AP Photo / Frank Augstein, File)
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The Biden administration is lifting its requirement that international air travelers to the U.S. take a COVID-19 test within a day before boarding their flights, easing one of the last remaining government mandates meant to contain the spread of the coronavirus.