The Federal Aviation Administration held some flights bound for Chicago O’Hare and Midway on Friday, Nov. 13, because of an equipment outage. The agency scheduled both ground stops through 3:30 p.m. Central. Travelers flying to either airport or connecting through Chicago should check their flight with their airline before leaving for the airport.

The O’Hare advisory listed a ground stop starting at 2:10 p.m. Central and cited communications issues. The Midway advisory gave a 2:17 p.m. start and listed an equipment outage. The FAA rated the likelihood of an extension as medium in both notices. The FAA’s live board showed both stops in effect shortly after 2:35 p.m. Central.

A ground stop keeps covered Chicago-bound flights at their departure airports until air traffic controllers release them. The advisories cover departures handled by a broad list of U.S. air traffic centers and some Canadian airports. The end time is the FAA’s scheduled cutoff. Passengers already booked on an affected flight should use the airline’s app or flight-status page for a revised departure time or connection information.

The Chicago Department of Aviation maintains a separate airport delay page for O’Hare and Midway. If you’re picking someone up, check their specific flight’s arrival time before driving to the terminal.