Here's the latest on the NOTAM outage that caused flight delays and cancellations

People pass through Salt Lake City International Airport on Wednesday. The outage of a key safety system led to thousands of flight delays and cancellations in the U.S. (Rick Bowmer/AP)

Flights across the U.S. slowly resumed Wednesday after a nationwide ground stop by the Federal Aviation Administration, stemming from the outage of a crucial piece of technology.

The failure of the Notice to Air Missions system, or NOTAM, caused airlines to cancel more than 1,300 flights, and delay nearly 10,000 more, according to flight tracker FlightAware.com.