U.S. regulators are investigating why Delta Air Lines failed to recover as quickly as other airlines from a global technology breakdown and whether Delta's treatment of passengers stranded by canceled and delayed flights violated federal rules.
Transportation Secretary Pete Buttigieg on Tuesday announced the investigation into Delta's response to the outage, which he said has affected more than half a million of the airline's passengers.
A Delta official said the airline expects to return to normal operations by the end of the week.
Delta and its Delta Connection partners canceled more than 500 flights Tuesday. That was down by more than half from Monday but still accounted for nearly two-thirds of all canceled flights in the United States, according to tracking platform FlightAware.
Many airlines were affected when cybersecurity company CrowdStrike sent a faulty update to more than 8 million Microsoft computers around the world late last week. Most of them reduced cancellations to roughly normal levels by the end of the weekend.
Atlanta-based Delta and its partners have canceled more than 6,500 flights since Friday, far more than any other airline, according to figures from FlightAware and travel-data provider Cirium.
Buttigieg said his department will investigate “how it could be that days after the other airlines are back to normal, Delta is still canceling hundreds of flights.”
At a news conference, Buttigieg said the Transportation Department will also examine Delta's customer service, including “unacceptable” lines for customer service and reports that unaccompanied minors were stranded at airports. He said the department has received more than 3,000 complaints about the airline's breakdown.
Delta said it was cooperating with the investigation.
“We remain entirely focused on restoring our operation after cybersecurity vendor CrowdStrike’s faulty Windows update rendered IT systems across the globe inoperable,” an airline spokesperson said in a statement. “Across our operation, Delta teams are working tirelessly to care for and make it right for customers" affected by the disruptions.
John Laughter, Delta’s chief of operations, said the airline was moving planes, pilots and flight attendants “to where they need to be so we can return to normal operations by the end of the week.”
The collapse at Delta has been stunning for an outfit that was widely viewed as the best big U.S. airline — the most profitable before and after the pandemic, and the best-run. In recent years, Delta has almost always ranked near the top among all U.S. carriers for on-time performance.
Delta appears to rely more than other airlines on systems that run on Microsoft Windows. The airline said upward of half its technology systems are Windows-based, including a key tool used to schedule pilots and flight attendants. That system could not keep up with the high number of changes triggered by the outage.
Delta said late Tuesday that a backlog of “issues” in the crew-scheduling system was reduced by 75% over the last 36 hours, and the airline was also making progress in returning lost bags to their owners.
In addition to probing the cause of Delta's collapse, investigators are likely to focus on whether Delta is complying with federal requirements such as offering prompt refunds to passengers whose flights are canceled or significantly delayed. The refunds are supposed to be in the form the customer used to pay for their ticket — typically a credit card — and not just a voucher.
In a text provided to The Associated Press, a Delta passenger whose flight was canceled Saturday was told, “If you prefer not to rebook your trip, your ticket value will automatically be available as an eCredit that can be used towards a future Delta ticket.”
In Washington, lawmakers are beginning to weigh in. Sen. Maria Cantwell, D-Wash., chair of the Senate committee that oversees airlines, said in a letter to Delta CEO Ed Bastian that she is “concerned” that Delta is not complying with passenger rights contained in a law that Congress passed in May.
“While the technology outage was clearly not caused by Delta or any airline, I am nevertheless concerned that Delta is failing to meet the moment and adequately protect the needs of passengers,” Cantwell wrote.
Delta’s meltdown mirrors that of Southwest Airlines, which canceled nearly 17,000 flights over 15 days in December 2022. A Transportation Department investigation ended with Southwest agreeing to pay a $35 million fine as part of a $140 million settlement.
Southwest blamed its breakdown on a winter storm, but other airlines recovered in a couple days while Southwest did not. Consumer advocates see the same pattern with Delta this month — the airline continues to blame the CrowdStrike outage while rivals such as American recovered quickly. Even United Airlines, the second-worst at cancellations, was back on track Monday.
“It's not about the thing that caused the problem, it's about how you recover from the problem. That's the test of an airline,” said William McGee, a former aircraft dispatcher who is a consumer advocate at the American Economic Liberties Project, a group critical of large corporations.
FILE - A Delta Air Lines plane leaves the gate on July 12, 2021, at Logan International Airport in Boston. U.S. airline regulators have opened an investigation into Delta Air Lines, which is still struggling to restore operations on Tuesday, July 23, 2024, more than four full days after a faulty software update caused technological havoc worldwide and disrupted global air travel. (AP Photo/Michael Dwyer, File)
A Delta Air Lines jet leaves the gate, Friday, July 19, 2024, at Logan International Airport in Boston. (AP Photo/Michael Dwyer)
Travelers stand in line at a Delta Air Lines counter at Reagan National Airport on Friday, July 19, 2024, in Arlington, Va. A global technology outage caused by a faulty software update grounded flights, knocked banks and media outlets offline, and disrupted hospitals, small businesses and other services on Friday, highlighting the fragility of a digitized world dependent on just a handful of providers. (AP Photo/Mark Schiefelbein)
DEIR AL BALAH, Gaza Strip (AP) — Overnight strikes by Israel killed at least 55 people across the Gaza Strip, hospital officials said Thursday, a day after senior government officials said Israel would seize large areas of Gaza and establish a new security corridor across the Palestinian territory.
Israel has vowed to escalate the nearly 18-month war with Hamas until the militant group returns dozens of remaining hostages, disarms and leaves the territory. Israel has imposed a month-long halt on all imports of food, fuel and humanitarian aid that has left civilians facing acute shortages as supplies dwindle.
Officials in Khan Younis, in the southern part of the strip, said the bodies of 14 people had been taken to Nasser Hospital – nine of them from the same family. The dead included five children and four women. The bodies of another 19 people, including five children aged between 1 and 7 years and a pregnant woman, were taken to the European hospital near Khan Younis, hospital officials said. In Gaza City, 21 bodies were taken to Ahli hospital, including those of seven children.
The Israeli military ordered the residents of several areas -- Shujaiya, Jadida, Turkomen and eastern Zeytoun -- to evacuate on Thursday, adding that the army “will work with extreme force in your area.” It said people should move to shelters west of Gaza City.
On Wednesday, Prime Minister Benjamin Netanyahu announced Israel was establishing a new security corridor across the Gaza Strip to pressure Hamas, suggesting it would cut off the southern city of Rafah, which Israel has ordered evacuated, from the rest of the Palestinian territory.
Netanyahu referred to the new axis as the Morag corridor, using the name of a Jewish settlement that once stood between Rafah and Khan Younis, suggesting it would run between the two southern cities. He said it would be “a second Philadelphi corridor ” referring to the Gaza side of the border with Egypt further south, which has been under Israeli control since last May.
Israel has reasserted control over the Netzarim corridor, also named for a former settlement, that cuts off the northern third of Gaza, including Gaza City, from the rest of the narrow coastal strip. Both of the existing corridors run from the Israeli border to the Mediterranean Sea.
“We are cutting up the strip, and we are increasing the pressure step by step, so that they will give us our hostages,” Netanyahu said.
The Western-backed Palestinian Authority, led by rivals of Hamas, expressed its “complete rejection” of the planned corridor. Its statement also called for Hamas to give up power in Gaza, where the militant group has faced rare protests recently.
Netanyahu’s announcement came after the defense minister, Israel Katz, said Israel would seize large areas of Gaza and add them to its so-called security zones, apparently referring to an existing buffer zone along Gaza’s entire perimeter. He called on Gaza residents to “expel Hamas and return all the hostages,” saying “this is the only way to end the war.”
Hamas has said it will only release the remaining 59 hostages — 24 of whom are believed to be alive — in exchange for the release of more Palestinian prisoners, a lasting ceasefire and an Israeli pullout. The group has rejected demands that it lay down its arms or leave the territory.
Netanyahu arrived in Hungary early Thursday on his second foreign trip since the world's top war crimes court issued an arrest warrant against him in November over Israel's war in Gaza.
Based in The Hague, Netherlands, the the International Criminal Court has said there was reason to believe Netanyahu and former Israeli Defense Minister Yoav Gallant used “starvation as a method of warfare” by restricting humanitarian aid to the Gaza Strip, and intentionally targeted civilians in Israel’s campaign against Hamas — charges that Israeli officials deny.
ICC member countries, such as Hungary, are required to arrest suspects facing a warrant if they set foot on their soil, but the court has no way to enforce that and relies on states to comply. As Netanyahu arrived in Budapest, Hungary said it will begin the procedure of withdrawing from the ICC.
On Sunday, Netanyahu said Israel plans to maintain overall security control of Gaza after the war and implement U.S. President Donald Trump’s proposal to resettle much of its population elsewhere through what the Israeli leader referred to as “voluntary emigration.”
Palestinians have rejected the plan, viewing it as expulsion from their homeland after Israel’s offensive left much of it uninhabitable, and human rights experts say implementing the plan would likely violate international law.
The war began when Hamas-led militants attacked southern Israel on Oct. 7, 2023, killing around 1,200 people, mostly civilians, and taking 251 hostages, most of whom have since been released in ceasefire agreements and other deals. Israel rescued eight living hostages and has recovered dozens of bodies.
Israel’s offensive has killed more than 50,000 Palestinians, according to Gaza’s Health Ministry, which doesn’t say whether those killed are civilians or combatants. Israel says it has killed around 20,000 militants, without providing evidence.
The war has left vast areas of Gaza in ruins and at its height displaced around 90% of the population.
Separately, Israeli strikes killed at least nine people in southwestern Syria, Syrian state media reported Thursday.
SANA said the nine were civilians, without giving details. Britain-based war monitor The Syrian Observatory for Human Rights said they were local gunmen from the Daraa province, frustrated with Israeli military encroachment and attacks in recent months.
Israel has seized parts of southwestern Syria and created a buffer-zone there, which it says is to secure Israel’s safety from armed groups. But critics say the military operation has created tensions in Syria and prevents any long-term stability and reconstruction for the war-torn country.
Israel also struck five cities in Syria late Wednesday, including over a dozen strikes near a strategic airbase in the city of Hama.
Follow AP’s war coverage at https://apnews.com/hub/israel-hamas-war
Relatives mourn the body of Ashraf Al Aqqad, who was killed in an Israeli army strike, before his burial at the hospital in Khan Younis, southern Gaza Strip, Thursday, April 3, 2025. (AP Photo/Abdel Kareem Hana)
Relatives of Ayad Jundia who was killed in an Israeli airstrike, grieve over his body at the Baptist Hospital in Gaza City, on Thursday, April 3, 2025. (AP Photo/Jehad Alshrafi)
Palestinians grieve over the bodies of their relatives, who were killed in an Israeli airstrike, as they brought to the Baptist Hospital in Gaza City, on Thursday, April 3, 2025. (AP Photo/Jehad Alshrafi)
Palestinians carry the bodies of those who were killed in an Israeli airstrike, as they brought to the Baptist Hospital in Gaza City, on Thursday, April 3, 2025. (AP Photo/Jehad Alshrafi)
Palestinians grieve over the bodies of their relatives, who were killed in an Israeli airstrike, as they brought to the Baptist Hospital in Gaza City, on Thursday, April 3, 2025. (AP Photo/Jehad Alshrafi)
Relatives of Ayad Jundia who was killed in an Israeli airstrike, grieve over his body at the Baptist Hospital in Gaza City, on Thursday, April 3, 2025. (AP Photo/Jehad Alshrafi)
Palestinians pray over the bodies of their relatives, who were killed in an Israeli airstrike, at the Baptist Hospital in Gaza City, on Thursday, April 3, 2025. (AP Photo/Jehad Alshrafi)
Palestinians grieve over the bodies of their relatives, who were killed in an Israeli airstrike, as they brought to the Baptist Hospital in Gaza City, on Thursday, April 3, 2025. (AP Photo/Jehad Alshrafi)
Yamama Jundia, 13, injured in an Israeli airstrike, grieves alongside others over the bodies of their relatives, who were killed in the same strike, at the Baptist Hospital in Gaza City on Thursday, April 3, 2025. (AP Photo/Jehad Alshrafi)
Palestinians grieve over the bodies of their relatives, who were killed in an Israeli airstrike, at the Baptist Hospital in Gaza City, on Thursday, April 3, 2025. (AP Photo/Jehad Alshrafi)
Inas Al Aqqad mourns the body of her husband Ashraf, who was killed in an Israeli army strike, before his burial at the hospital in Khan Younis, southern Gaza Strip, Thursday, April 3, 2025. (AP Photo/Abdel Kareem Hana)
Relatives mourn the body of Ashraf Al Aqqad, who was killed in an Israeli army strike, before his burial at the hospital in Khan Younis, southern Gaza Strip, Thursday, April 3, 2025. (AP Photo/Abdel Kareem Hana)
Mourners pray over the body of a woman killed in an Israeli army strike, before her burial at the hospital in Khan Younis, southern Gaza Strip, Thursday, April 3, 2025. (AP Photo/Abdel Kareem Hana)
Yamama Jundia, 13, injured in an Israeli airstrike, grieves alongside others over the bodies of their relatives, who were killed in the same strike, at the Baptist Hospital in Gaza City on Thursday, April 3, 2025. (AP Photo/Jehad Alshrafi)
Palestinians inspect a UN building after it was hit by an Israeli strike, in Jabaliya, northern Gaza Strip on Wednesday, April 2, 2025. (AP Photo/Jehad Alshrafi)
Palestinians inspect a UN building after it was hit by an Israeli strike, in Jabaliya, northern Gaza Strip on Wednesday, April 2, 2025. (AP Photo/Jehad Alshrafi)
