Passenger traffic at Burbank Bob Hope Airport rose again in July, the sixth straight month of gains at the San Fernando Valley’s only commercial airfield.

The airport served 334,738 passengers, up 3.8 percent from July 2014 when 322,512 passengers came through the terminal.

The airport attributed the increase to the airlines making seasonal adjustments in June for summer travel, increasing the number of flights from Burbank.

United Airlines had the highest monthly increase of the six major airlines serving the airport, helped by adding flights on its weekend schedule serving Denver and San Francisco. It transported 20,774 passengers, up more than 2,700 or 15.4 percent from a year ago.

Southwest Airlines, the carrier with the most flights at Bob Hope, saw just a small increase in terms of passengers served with 241,813, or 2.8 percent increase from July of last year. US Airways experienced the biggest drop, falling 14.4 percent to 16,198 passengers. Delta Airlines was off 7.3 percent to 6,860 passengers in July.

Commuter airline SeaPort Airlines, which began service at Bob Hope in 2013 with flights to and from the Imperial Valley, saw an increase to 1,706 passengers in July compared to 177 in the same month a year earlier. SeaPort also provides service to San Diego, Sacramento, Visalia and San Felipe, Mexico from Burbank.

The airport has struggled in the past few years as flight traffic and passenger counts dwindled amid the recession, and as carriers consolidated operations at larger airports to keep planes full. The airport is currently in discussions with the city of Burbank over a proposed new 14-gate terminal building to be constructed on the property.