Operations mostly back to normal as Delta, Southwest and Alaska experience system outages on Monday

Jun 15, 2021

This post contains references to products from one or more of our advertisers. We may receive compensation when you click on links to those products. Terms apply to the offers listed on this page. For an explanation of our Advertising Policy, visit this page.

Editor’s note: This post has been updated with a statement from Delta


Southwest Airlines planes have resumed flying following a short period during which the airline had an issue with its weather data provider on Monday night.

As a result of the performance issues with the third-party weather data provider, Southwest elected to ground its aircraft, delaying passengers’ travel plans across the country.

Sign up to receive the daily TPG newsletter for more travel news!

“While the vendor worked to restore connectivity, we implemented a ground stop to protect the safety of our crews and customers,” Southwest said in a statement.

According to data from flight-tracking service FlightAware, Southwest Airlines saw 1,412 delays to its flights on Monday — more than any other airline that the service tracks. Of Southwest’s flights for the day, the 1,412 delays represented about 38% of its flights.

The airline avoided having to cancel many flights as a result of the groundings. Of its flights on Monday, only 45 were canceled — about 1% of its operation for the day — which could have also been due to a number of other factors.

The airline’s Twitter account was dotted with responses to complaints from passengers who were delayed as a result of the grounding.

Southwest isn’t the only American airline that experienced issues with its back-end systems that caused customer disruption on Monday. Both Delta Air Lines and Alaska Airlines experienced similar booking system problems that saw would-be passengers unable to book new tickets with the respective carriers.

In the case of Delta, the booking portal was only showing customers First and Comfort+ fares, rather than those in economy. TPG staffers reported that the issues affected flights across Delta’s network and on a multitude of booking platforms.

TPG reached out to Delta, and they said, “Delta teams are working to quickly address a technical issue that is making it difficult for customers to purchase flights on delta.com, the Fly Delta app, and through our Reservations Call Center. The ability to check in for flights is not affected. We apologize to our customers for any inconvenience this is causing.”

With Alaska, meanwhile, the website displayed a notice that it had been experiencing issues across its network on mobile and desktop bookings and for bookings via its call center.

Related: Airline flight booking and search engines crashed for nearly 4 hours on Monday

“We are currently experiencing issues that affect shopping at alaskaair.com, our mobile app and through our contact center,” the airline said in a statement on its website. “We are actively working with our partner that powers our shopping platform to resolve the issue. We apologize for the inconvenience.”

As of the time of publication, both Delta and Alaska’s booking systems have been restored, and Southwest’s aircraft appear to be operating without major delays.

In April, the engine that powers a number of airlines’ flight search and booking systems was down for nearly four hours. The outage affected American, Delta, United and Alaska.

Featured photo by Bloomberg/Getty Images.

Delta SkyMiles® Platinum American Express Card

Earn 90,000 bonus miles after you spend $3,000 in purchases on your new Card in your first 3 months. Offer ends 8/3/2022.

With Status Boost™, earn 10,000 Medallion Qualification Miles (MQMs) after you spend $25,000 in purchases on your Card in a calendar year, up to two times per year getting you closer to Medallion Status. Earn 3X Miles on Delta purchases and purchases made directly with hotels, 2X Miles at restaurants and at U.S. supermarkets and earn 1X Mile on all other eligible purchases. Terms Apply.

Apply Now
More Things to Know
  • Limited Time Offer: Earn 90,000 bonus miles after you spend $3,000 in purchases on your new Card in your first 3 months. Offer ends 8/3/2022.
  • Earn up to 20,000 Medallion® Qualification Miles (MQMs) with Status Boost® per year. After you spend $25,000 in purchases on your Card in a calendar year, you can earn 10,000 MQMs up to two times per year, getting you closer to Medallion® Status. MQMs are used to determine Medallion® Status and are different than miles you earn toward flights.
  • Earn 3X Miles on Delta purchases and purchases made directly with hotels.
  • Earn 2X Miles at restaurants worldwide including takeout and delivery in the U.S., and at U.S. supermarkets.
  • Earn 1X Miles on all other eligible purchases.
  • Receive a Domestic Main Cabin round-trip companion certificate each year upon renewal of your Card. Payment of the government imposed taxes and fees of no more than $80 for roundtrip domestic flights (for itineraries with up to four flight segments) is required. Baggage charges and other restrictions apply. See terms and conditions for details.
  • Enjoy your first checked bag free on Delta flights.
  • Fee Credit for Global Entry or TSA PreCheck® after you apply through any Authorized Enrollment Provider. If approved for Global Entry, at no additional charge, you will receive access to TSA PreCheck.
  • Enjoy an exclusive rate of $39 per person per visit to enter the Delta Sky Club® for you and up to two guests when traveling on a Delta flight.
  • No Foreign Transaction Fees.
  • $250 Annual Fee.
  • Terms Apply.
  • See Rates & Fees
Regular APR
17.24%-26.24% Variable
Annual Fee
Balance Transfer Fee
Recommended Credit
Terms and restrictions apply. See rates & fees.

Editorial Disclaimer: Opinions expressed here are the author’s alone, not those of any bank, credit card issuer, airlines or hotel chain, and have not been reviewed, approved or otherwise endorsed by any of these entities.

Disclaimer: The responses below are not provided or commissioned by the bank advertiser. Responses have not been reviewed, approved or otherwise endorsed by the bank advertiser. It is not the bank advertiser’s responsibility to ensure all posts and/or questions are answered.