Thousands of flights canceled or delayed again as global IT outage continues to wreck havoc across the US - here are the airlines impacted

Thousands of American flights continue to be either canceled or delayed in the wake of last week's global IT outage.

As of noon Sunday, there were over 1,200 flights canceled and more than 4,600 delays, according to flight-tracking website FlightAware - most of them from Delta and United.

Affected airports include Minneapolis–Saint Paul International and Hartsfield-Jackson in Atlanta, which collectively account for hundreds of the delays and cancellations by themselves.

Others still seeing scheduling slip-ups include Boston Logan International, LA International, Chicago O'Hare International, Denver International, San Francisco International, Dallas Fort Worth International, and Detroit Metro Wayne Co.

Also held up is Newark and LaGuardia, as some travelers have taken to setting up de facto campsite amid the continued chaos, which reps are trying to address. 

As it stands, Delta is the worst impacted - with 40 percent of its fleet delayed to some extent.

'Delta is continuing its operational recovery Saturday following an outside vendor technology issue that prompted the airline and many others to pause flying for several hours,' the company said in a statement a day earlier when delays and cancellations were even worse.

'Across the operation, Delta teams in airports, on board flights, on the phones and in messaging are working tirelessly to care for customers as the airline works to put flight crews and aircraft back in position following the disruption.

'Delta is notifying customers about delays and cancelations in their itinerary via the Fly Delta app and text message, and offering re-booking options that can be managed online,' the Saturday bulletin went on.

'Customers are encouraged to check delta.com or the Fly Delta app for the latest information about their itinerary.'

The update went on to offer a waiver that allowed all passengers whom had been traveling Friday to rebook their flights - a move mimicked by United.

The carrier also issued a waiver for select airports so passengers could make changes if their flights were and are still affected, with a rep on Sunday confirming that nearly all of the airline's flights depart or arrive in one of the covered airports.

These include the heavily congested Minneapolis–Saint Paul and Hartsfield-Jackson hubs, which currently account for 248 and 804 delays respectively.

In terms of cancellations, the pair - which appeared to be the hardest hit early Sunday afternoon -  Minneapolis–Saint Paul is experiencing more than r 100.

Hartsfield-Jackson Intl, meanwhile, has recorded nearly 360, according to constantly updating statistics on flightaware.com.

Overall, total delays within, into, or out of the US stood at 3,817, with 1,199 American flights fully cancelled.

LaGuardia, meanwhile, is in the midst of just over 100 delays, along with 90 or so cancellations.

Newark a few miles away recorded a similar 92 delays, along with 88 cancellations.

Dallas-Fort Worth Intl is another hub experiencing heavy delays, with 515 as of 1pm ET. In terms of cancellations, though, the number for the Texas facility is much less pronounced - just over 50.

The same can be said about popular airports overseas like London Gatwick and Munich International, where travelers are still dealing with delays in the hundreds, but far fewer cancellations.

The same holds true for the remaining affected airports in the US, with facilities like Denver International and Detroit Metro recording delays in the low hundreds but cancellations only in the dozens.

Overseas, footage posted on social media shows travel chaos at Gatwick with hundreds left stranded at the airport as they wait for information about their flights.

In the States, travel writer Steve Stephens on Sunday reported that 'little Delta refugee camps' have popped up at Minneapolis–Saint Paul, as passengers entered Day 3 of the disaster created by an update pushed out to customers of cybersecurity firm CrowdStrike.

This caused several carriers' Windows software to shut down, sans Southwest - due to it using an older version of Windows more than two decades old.

'Little @Delta refugee camps popping up all over MSP Gate F. Even tents,' Stephens wrote early Sunday, sharing a photo that looks more like a migrant entry center in a sanctuary city than a Midwest Airport.

'Really. No campfires yet, but that probably violates FAA regulations anyway,' he joked.

He added about an hour later: 'Still only two @Delta customer service reps for a line still stretching to Wisconsin.

'I’m striking out to establish a colony in Gate G.'

Two hours later, he shared a photo of an automated AI-powered robot/Delta employee, while sarcastically sniping: 'The top customer service rep for @Delta has arrived at MSP [Minneapolis–Saint Paul Intl].' 

Similar scenes were recorded by photographers at Detroit Metropolitan Wayne County, where dozens of travelers were set up Sunday in blankets trying to grab some shut-eye

The Department of Transportation, meanwhile, has said it will require all airlines to offer customers a refund if their flights are canceled for any reason, but customers may be entitled to additional compensation if a cancellation is within the airline's control.

As it stands, Delta accounts for 40 percent of delays seen worldwide, while United stands at eight percent.

Travelers seeking monetary compensation for affected flights have been told to file a claim with their respective airlines, as some of the cancellations and delays stem from increment weather.

Hundreds of others stem from orders from respective planes' carriers, as they promised Saturday to address the IT-related issue.

'We apologize to those customers who have had their travel plans disrupted as a result of this technology issue,' they said in their statement.

'Delta people are working around the clock to get customers where they need to be. Unexpected disruptions like these are difficult and do not reflect the operational reliability and experiences customers have come to know and expect from us. 

'We will continue to offer meal vouchers and hotel accommodations where available for customers whose flights are significantly delayed or canceled Saturday.'