The United ground stop has been lifted at airports in multiple cities as the airline resolved a technical issue. There are still residual delays.

United Airlines resolved a “technology issue” that triggered a ground stop for the carrier’s flights at major U.S. airports Wednesday evening that led to hundreds of delays and some cancelations, although the airline was still tackling residual delays triggered by the outage.

A tech outage led United Airlines to ground flights nationwide Wednesday night, and even with the issue now resolved, over 1,000 flights have been delayed and dozens canceled.