The Japanese unit of Chinese budget carrier Spring Airlines Co. opened three Japanese routes Friday following two postponements caused by training delays.

The routes will connect Narita International Airport with Takamatsu Airport in Kagawa Prefecture, Hiroshima Airport and Saga Airport, with one daily round-trip flight for Takamatsu and two for the others.

The routes were originally supposed to be launched in may, but problems with training the crew members and other preparations caused delays, according to Spring Airlines Japan Co., based in Narita, Chiba Prefecture.

"The long-awaited flight services kicked off. I hope to obtain customers' trust through safe operations and warm services," Spring Airlines Japan President Hiroshi Ugai said at the opening ceremony, which was attended by 50 officials at Narita airport.

The carrier said it is aiming for a seat occupancy ratio of 70 to 80 percent.