Computer Glitch Grounds All United Airlines Flights in The US

UPDATE: 10 a.m. ET The FAA has lifted the ground stop according to Reuters.

BREAKING: United Airlines flights are no longer grounded: FAA

— Reuters Top News (@Reuters) July 8, 2015

UPDATE: 9:43 a.m. ET United Airlines has issued a response on Twitter.

We experienced a network connectivity issue. We are working to resolve and apologize for any inconvenience.

— United (@united) July 8, 2015

All United Airlines flights in the U.S. were grounded on Wednesday.

The Federal Aviation Administration issued a ground stop alert at 7:49 a.m. Wednesday morning, saying they were alerted by United of a systemwide issue.

"We experienced a network connectivity issue this morning," a United spokesperson said shortly after 9 a.m. EST. "We are working to resolve this and apologize to our customers for any inconvenience."

The ground stop affects all of United's mainline flights. United Express, the airline's regional partner, has been released from the ground stop, but since most of those flights are connectors to United hubs, they will all likely be impacted by the computer issues. The issue has impacted roughly 3,500 flights thus far, according to the airline.

Reactions on Twitter were immediate:

Uh oh. "System-wide @United #ITFail" pic.twitter.com/ek3PISOl3x

— William Allison (@billallison) July 8, 2015

@united what's going on?!? All flights and system down? Close to an hour now at the gate. pic.twitter.com/tQrPwYpbvj

— brooke (@cbrookewit) July 8, 2015

People have resorted to sitting down at @united baggage check line in Boise. Computer system outage #UnitedAirlines pic.twitter.com/qTFhCR7aOC

— Jeralyn Novak (@AgCommunicator) July 8, 2015

#UnitedAirlines the current line pic.twitter.com/w2eZPFYxkl

— Meadow (@Meadow_k26) July 8, 2015

#UnitedAirlines system down. #FAA #groundstop nationwide. All flights grounded pic.twitter.com/ZNBWxCBRmt

— Srini Marimganti (@SMarimganti) July 8, 2015

A similar situation occurred last month when a computer glitch temporarily grounded United's entire fleet.

More details as they develop.