The parent of Hawaiian Airlines said on Tuesday that earnings more than doubled in the second quarter amid strong demand across all the regions it serves, good economic conditions, stable fuel prices and good cost control.

Hawaiian Holdings Inc. reported net income of $27.3 million, or 43 cents a share, compared with $11.3 million, or 21 cents a share, in the quarter a year earlier. Revenue rose 7.8 percent to $575.7 million from $533.9 million.

The company also said that it has signed a memorandum of understanding with Airbus to acquire six new A330-800neo aircraft starting in 2019, with rights to purchase an additional six aircraft. The order replaces Hawaiian’s existing order for A350XWB-800 aircraft, which were due for delivery from 2017. Airbus had seen limited demand for the A350-800s.