The move has the potential to increase competition in Japan by allowing Delta to funnel international travelers via Tokyo to more Japanese cities that Skymark serves. A deal would give Delta a roughly 20-percent stake, although terms must still be concluded and approved by Skymark’s creditors, according to the report by Nikkei Asian Review. A Delta spokeswoman said, “It would be premature for us to comment on the matter.” Delta’s President Ed Bastian said last month that the Atlanta-based airline had been approached about making the investment.