To survive intensifying domestic competition, All Nippon Airways Co. will unify flight codes of its group airlines and improve on-time flight rates, the company said Thursday.

The moves are designed to strengthen its corporate image against Japan Airlines Co. and Japan Air System Co., which plan to integrate under a holding company in October, an ANA spokesman said.

Currently, a flight is recognized as on time if it arrives or departs within 15 minutes of its schedule. ANA will revise its time scale to a margin of one minute in fiscal 2002 and 2003.

The new target for on-time domestic departure is 70 percent. To achieve the goal, about 4,500 more flights a year will need to depart on time compared to last year, the company said.

Last year, 68.1 percent of flights departed on time if viewed under the new one-minute margin system.