The summer airfare war will continue through the end of the year as startup airline go! announced yesterday a new round of $29 one-way fares to the Neighbor Islands.

The $29 one-way fares were immediately matched by Hawaiian Airlines and Aloha Airlines.

The new offer is good for travel through Dec. 31, except on Christmas, Thanksgiving, New Year's Eve and surrounding dates. Tickets must be purchased by Friday.

Go! previously offered $29 fares for travel through Sept. 30, which were matched by Hawaiian and Aloha.

"We are proud to lead the Hawai'i market by offering the lowest possible price for interisland travel through the remainder of the year," said Jonathan Ornstein, chief executive officer of Phoenix-based parent Mesa Air Group, which owns go!

Go! touched off the price war when it opened for business in Hawai'i on June 9 with $39 one-way interisland tickets, prompting Hawaiian and Aloha to match the fare.

Go! later sold a limited number of tickets for $19. Hawaiian matched the fare cuts while Aloha offered free roundtrip tickets to 1,000 customers who lined up at Aloha's airport ticket counters June 9.

The lower prices appear to be boosting travel by local residents, many of whom had cut back on Neighbor Island trips when one-way prices jumped to $80 or more after Sept. 11.

In July go! said it served 69,680 passengers and that its planes were 73.9 percent filled.

Hawaiian planes, which include those used on Neighbor Island and Mainland flights, were 89.3 percent filled, while figures for Aloha were not available.