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Flight cancellations continue this weekend following Friday’s IT outage that wreaked havoc globally – affecting everything from air travel to banking and critical infrastructure.

Although airlines successfully got planes back in the air on Friday following early morning operational disruptions by several carriers, residual disruptions made Saturday another chaotic day at the airport.

By late Saturday morning, airlines had canceled more than 1,100 flights in the US, according to data from flight-tracking site FlightAware. It comes a day after airlines delayed an additional 3,400 flights – and a staggering 12,895 more – on Friday. All told, more than 4,500 flights have been canceled in the US and another 16,000 have been delayed since the IT outage began affecting flights.

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Which airlines are affected?

Among US carriers, Delta Air Lines and United Airlines are experiencing the worst residual operational impacts this weekend, with hundreds of cancellations between the two carriers.

Delta Air Lines

Delta reported more than 600 cancellations from its mainline and regional Delta Connection flights scheduled for Saturday, most of which occurred in the morning and early afternoon.

“Additional cancellations are expected as some of Delta’s technology continues to recover from the Friday morning vendor issue,” the Atlanta-based carrier said in a statement.

Delta has also suspended all unaccompanied minor flights until Sunday, affecting all children under 18 planning to fly alone.

United Airlines

For its part, United said late Friday that most of its systems had recovered from the tech outage, but warned that its operations “may continue to experience some disruption.”

By late Saturday morning, United had canceled more than 275 flights, about 9% of its operations.

Carriers, like Delta and other US airlines, have issued a travel advisory that allows even passengers traveling on restricted tickets to change itineraries — and with no difference in fares.

What are you owed to the airline after a flight cancellation?

The US Department of Transportation is treating the disruptions as “manageable” cancellations and delays, an agency spokeswoman told TPG on Friday.

That means the DOT sees these flight problems as the airline’s responsibility — and calls on the airlines to keep their promises. Airlines customer service dashboard, found on FlightRights.govFor guarantees like food, hotel and ground transportation expenses for stranded passengers.

“Our department has reminded airlines of their responsibilities to passengers,” Transportation Secretary Pete Buttigieg wrote on social media Friday. “As with any mechanical or technical failure, airlines need to take care of passengers experiencing long delays or cancellations in this case.

Delta has clarified that it is already providing those benefits to affected passengers.

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Can you get a refund for a canceled flight?

Keep in mind, under DOT policy, if your flight is canceled or significantly delayed, If you ultimately choose not to travel, you are entitled to a refund back to the original form of payment.

You don’t need to accept vouchers or frequent flyer miles.

However, if you accept the airline’s rebooking offer, you are not refund-eligible.

A messy few days for air travel

The IT outage at Austin-based cybersecurity firm CrowdStrike occurred Friday during a system update, and Affected Microsoft clients all over the world.

The outage disrupted key digital infrastructure at numerous airlines, helping to cancel thousands of flights globally on Friday. Airlines canceled more than 3,400 flights in the US alone on Friday.

Delta and United are moving forward with delayed disruptions on Saturday, with those airlines’ major hubs the hardest hit.

Hartsfield-Jackson Atlanta International Airport (ATL) — Delta’s home base — has had the most cancellations of any US airport so far, Saturday, FlightAware shows. It is followed by two other Delta hubs: New York’s LaGuardia Airport (LGA) and Minneapolis/St. Paul International Airport (MSP).

You can also expect disruptions at major United hubs such as Chicago’s O’Hare International Airport (ORD), Newark Liberty International Airport (EWR) and Denver International Airport (DEN).

American Airlines, which canceled more than 400 flights on Friday, largely recovered operations Saturday with just 28 cancellations — less than 1% of its operations, per FlightAware. Several other carriers, from Alaska Airlines to JetBlue and Southwest, are also reporting lower cancellation rates.

Here’s more about what you can do if your flight is canceled or delayed.

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