UPDATE: The ground stop has been lifted. We’re working to get flights on their way. We apologize for the inconvenience to our customers.
— United (@united) January 23, 2017
Passengers at Newark Airport tweeted that they were stopped on the Tarmac for hours.
#unitedairlines have you tried unplugging the system, and plugging it back in? I'd like to go home now. UA224 EWR - MSY pic.twitter.com/bDHiBxNOge
— Matt Edens (@mgedens) January 23, 2017
It was not immediately clear how many flights were affected, or what caused the glitch. The ground stop lasted about 2 1/2 hours.