Major US airlines recovering after technology issues caused problems

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United Airlines and Delta Air Lines are recovering after experiencing a technology issue Monday that caused problems for travelers around the world.

Some passengers on social media reported delays as they tried to board aircraft and airlines’ websites and apps appeared to, at times, not function properly.

On Tuesday afternoon, United Airlines’ app and website said the airline was “working to fix a temporary technical issue affecting united.com and the United app.”

“United encountered a brief technology issue connected to a vendor that prevented customers from logging into their MileagePlus accounts,” United said in a statement. “The issue has been resolved and there was no impact to our flight operations.”

Delta also confirmed it was experiencing technology issues on Tuesday and was working to return things to normal.

“Delta systems are stabilizing after a limited global technology issue that affected data connectivity to some of our systems behind-the-scenes,” the airline said in a statement. “We appreciate our customers’ patience and understanding.”

The tracking site Down Detector indicated the American Airlines website and app were also experienced issues. However, the airline did not respond to CNN’s request for comment.

The complicated IT technology used by airlines is made up of in-house systems as well as technology operated by outside vendors and used by multiple carriers. It’s not clear exactly what went wrong on Tuesday, but airlines have had previous technology outages for several reasons.

In July, American was forced to halt flights for less than an hour due to an IT outage that “briefly impacted connectivity.”

In August 2025, a technology issue prompted United to ground flights and caused over 1,000 delays and dozens of cancellations.

And most notably, in 2024, a software update for Microsoft Windows operating systems issued by the cybersecurity firm CrowdStrike brought systems down at businesses around the world. Delta, United, American Spirt, Frontier, Allegiant and Sun Country were among the airlines impacted.

Tayfun Coskun/阿纳多卢/盖蒂图片社

周一，美国联合航空公司和达美航空公司遭遇技术故障，给世界各地的旅客造成了不便，目前两家航空公司正在逐步恢复运营。

一些乘客在社交媒体上反映，他们在登机时遇到延误，而且航空公司的网站和应用程序有时似乎无法正常运行。

周二下午，美联航的应用程序和网站表示，该航空公司正在“努力修复影响 united.com 和美联航应用程序的临时技术问题”。

美联航在一份声明中表示：“由于供应商提供的服务出现短暂的技术故障，导致乘客无法登录其 MileagePlus 账户。该问题已得到解决，并未对我们的航班运营造成任何影响。”

达美航空也证实，周二该公司遇到了技术问题，目前正在努力恢复正常运营。

达美航空在一份声明中表示：“此前，由于全球范围内的技术问题，部分后台系统的数据连接受到影响，目前达美航空的系统正在恢复稳定。感谢乘客的耐心和理解。”

故障追踪网站Down Detector显示，美国航空公司的网站和应用程序也出现了故障。然而，该航空公司没有回应CNN的置评请求。

航空公司使用的复杂IT技术由内部系统以及外部供应商运营并供多家航空公司使用的技术组成。目前尚不清楚周二究竟发生了什么，但航空公司此前也曾因多种原因发生过技术故障。

7 月，由于 IT 系统故障导致“网络连接短暂受到影响”，美国航空被迫停飞不到一个小时。

2025 年 8 月，由于技术问题，美联航停飞了部分航班，造成 1000 多架次航班延误和数十架次航班取消。

尤其值得注意的是，2024年，网络安全公司CrowdStrike发布的微软Windows操作系统软件更新导致全球多家企业的系统瘫痪。达美航空、美联航、美国精神航空、边疆航空、忠实航空和太阳乡村航空等航空公司均受到影响。