Allegiant Air planned to make a big splash in the Hawaii market this month with five new routes from four mainland cities.

But it turned out to be a big letdown for 662 passengers whose trips were delayed as much as 26 hours last weekend when three of the carrier’s five Boeing 757s were grounded overnight due to mechanical problems.

Passengers on Honolulu-bound flights from Stockton, Calif., and Bellingham, Wash., as well as Bellingham-to-Maui passengers, were instead inundated with vouchers as the apologetic Las Vegas-based carrier tried to remedy three isolated mechanical incidents.

Passengers on the second-ever Stockton-to-Honolulu flight suffered the worst of it as their Sunday afternoon flight was delayed 26 hours and they didn’t arrive in Honolulu until 11 p.m. Monday night rather than at 9:05 p.m. Sunday as scheduled. 

Overall, 13 of the 662 affected passengers decided to opt out from their trips and accepted refunds.

Service that began this month to Honolulu from both Santa Maria, Calif., and Eugene, Ore., have experienced no such mechanical interruptions.