A United Airlines ground stop has been lifted at multiple airports across the country. The ground stop impacted major hubs like Chicago O'Hare International Airport for hours, causing long waits and extensive delays for passengers arriving and departing.

TAMPA, Fla. (WFLA) — A system outage to United Airlines occurred Wednesday at 8 p.m., triggering a ground stop. The domino effect of delays could be seen at Tampa International Airport Thursday morning. ‘We are grieving’: Several Citrus High School students involved in deadly crash, officials say

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.