United Airlines resumed operations after it temporarily grounded all of its mainline flights on Wednesday evening due to a technical issue.

"We are working with customers to get them to their destinations after a technology disruption on Wednesday evening," United Airlines wrote in a post on its Instagram story. "The underlying technology issue has been resolved, and, while we expect residual delays, our team is working to restore our normal operations."

Mainline flights are operated directly by United, using its own aircraft and crew. These typically include Boeing 737, 757, 767, 777, and 787 jets, as well as Airbus A319 and A320 models.

Transportation Secretary Sean Duffy said Wednesday night that he was briefed by United CEO Scott Kirby and that the technical issue was "specific to United's operations" and was "unrelated to the broader air traffic control system."

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