JetBlue flights across the country were delayed Friday morning after an hours-long system outage, the company said. The carrier would not confirm if any flights were grounded.
"The system is slowly returning to normal. We're dispatching flights," JetBlue spokesman Michael Miller told NBC News. The outage affected an IT system critical to releasing planes with accurate flight information in the cockpit, Miller said.
About a third of JetBlue's flights were listed as "delayed" on the flight monitors at John. F. Kennedy International Airport, JetBlue's largest terminal. The typical delay was about 90 minutes.
Some delayed fliers took to Twitter to vent their frustrations. "Please work faster," tweeted @Green000s. You've had 4 hours to get your tech people on this. Bring in the A team."
"Pilot was late and now can't print paperwork. Are you kidding me?," tweeted @daisy18.
JetBlue's social media team quickly responded to the complaints with tweets like: "The computer programs are not working correctly. We're working now to address it. All flights are delayed until it can be resolved."
No information was available yet as to whether affected passengers would receive refunds per JetBlue's Passenger Bill of Rights.
The Associated Press contributed to this report.