Travel software company Sabre says it has fixed a technical issue that affected booking services of its U.S. airline partners such as Southwest, Virgin America and JetBlue.


Customers of these airlines were unable to book or modify existing reservations due to a temporary outage of Sabre's computer systems.


A Sabre spokeswoman said the outage of a pricing engine, which manages fares and seat availability for anyone making a reservation, had impacted travel agents and customers.
"Domestic booking functionality on Southwest.com is back up and running at this time," Southwest tweeted.