JetBlue said flights were still departing, but many were delayed or canceled. Some consumers on social media shared scenes of long lines at JetBlue desks and said they had difficulty checking in for flights or printing boarding passes.
Verizon said power went out at a data center at 11:37 a.m. ET, but has since been restored. Just after 2:30 p.m. ET, JetBlue said online check-in and flight booking services were working. Users previously had trouble accessing both its website and mobile app.
The issues affected major hubs including the Los Angeles International Airport, John F. Kennedy International Airport in New York and Logan International Airport in Boston.
JetBlue recommended that customers talk to airport staff about the status of their flights.
One traveler in Boston said she boarded a JetBlue flight shortly after 2 p.m. following a roughly 90-minute delay. Another noted that she had waited in a Fort Lauderdale, Florida, airport for her flight since earlier Thursday morning.
JetBlue shares rose more than 2 percent Thursday with a broader market rally.
This story is developing. Please check back for further updates.
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