United Airlines paused departures on flights nationwide around midday Tuesday because of a technology issue at the Chicago-based carrier.

       United asked the FAA to pause all departures nationwide, the FAA said. Around 12:50 p.m., the agency said United had lifted the ground stop for the U.S. and Canada, and shortly after that United said it had “identified a fix for the technology issue” and flights had resumed.

       Earlier, United executives said in a statement they were “experiencing a systemwide technology issue.” They did not elaborate on the exact nature of the problem, but an FAA advisory said the carrier was “unable to contact their dispatch through normal means” and could use alternate means if requested.