Struggling Skymark Airlines Inc. will likely delay a code-sharing deal with All Nippon Airways Co. as a result of the carrier's improved performance, sources have said.

ANA had asked Skymark to employ ANA's flight reservation system as a condition for launching the code-sharing operation, originally scheduled for late October, but Skymark has hesitated, causing negotiations to stall, the sources said Sunday.

Behind the situation is Skymark's strengthening performance on the back of lower oil prices and an improving load factor, they said.

In January last year, Skymark filed for court protection from creditors amid debts totaling ¥71.09 billion.

An agreement was reached in September for Skymark to receive support from ANA's parent company, ANA Holdings Inc.

Under the planned code-sharing deal, ANA would buy some of the seats in Skymark flights and sell them to its customers. The arrangement would improve Skymark's business and allow ANA to expand its flight network.