UNITED AND ALOHA AIRLINES plan to expand their code-share agreement. United has also taken a minority stake in Aloha and now occupies a seat on Aloha's board of directors. Neither airline indicated how large United's stake is, but United said it "could expand over time." The current code-sharing between the airlines consists solely of United placing its code on Aloha's interisland flights. Under an expanded agreement, each carrier would be able to place its code on the other's flights between Hawaii and the mainland U.S. and on flights to Japan.