Hawaiian Airlines’ earnings soared 62.9 percent during the second quarter amid robust demand for a Hawaii vacation, modest industry capacity growth, lower fuel costs and a more favorable foreign exchange environment.

The parent of the state’s largest carrier said today it also will be adding two additional Boeing 717s to its fleet so that it can increase service during peak times beginning early next year on its interisland routes.

Hawaiian Holdings Inc. reported that net income rose to $79.6 million, or $1.48 a share, from $48.8 million, or 79 cents a share, in the year-earlier quarter. Revenue rose 4.1 percent to $594.6 million from $571.3 million.