JetBlue Airways will boost daily departures from Boston by 30 percent by next summer, the airline said Thursday.

Including the expansion, JetBlue will offer 78 flights to 33 destinations.

The airline is expanding service to Chicago, Baltimore, Washington, Denver, San Francisco, Fort Lauderdale and several other cities.

It will add four weekly flights to Santo Domingo, Dominican Republic, and one weekly flight to Montego Bay, Jamaica.

The move comes as rivals cut capacity and adjust routes strategically to capture more passengers as softness in demand has cut into the industry's bottom line.

US Airways said this week it would cut some flights and concentrate closely on its hubs in Charlotte, Philadelphia and Phoenix as well as Washington DC, and its shuttle between New York, Boston and Washington.

Delta Air Lines is ramping up its New York LaGuardia operations and Southwest Airlines said this month it would add service to Denver.

JetBlue posted a USD$15 million profit in the third quarter, one of only a few carriers to do so during the summer period.