Travelers on JetBlue may face delays Tuesday morning because of a software problem.

JetBlue said the outage happened early in the morning and was over by 5:30 a.m., but its “systems are recovering.” The outage problem involved Sabre, the system that handles airlines’ reservations.

JetBlue said it did “not expect significant operational impact to flights today.” But the airline warned that some customers “may experience longer lines in some airports this morning as we resolve any lingering issues related to the outage.”

No flights were canceled, said JetBlue officials.

The delays are hitting JFK Airport in New York and Newark Airport in New Jersey.