JetBlue is still evaluating its options for serving London despite a report from Airport Coordination Limited (ACL) confirming the airline has garnered a total of 270 slots at London Heathrow for the U.S. summer season.

The carrier now believes first quarter demand will be better than expected.

Hawaiian Airlines is the latest U.S. operator to cite growing momentum in bookings, and as a result the company’s outlook for the first quarter has improved.