Originally Posted by linsj
Trying to book ORD-HNL online with discount code. Return trip always comes up U fare. According to ozstamps fare code thread, U is a TED fare, but this isn't a TED flight. Does anyone know if U is upgradeable with miles?
U isn't just a Ted fare. UA has been using E and U class for fares that match DL SimpliFares and the new AA fare structure. The UA E and U typically match the DL Y and B fares, and the AA Y and K fares.
The new AA fare structure has Y and K fares on most routes for unrestricted tickets. Think of K as having all the features of Y, except it's inventory controlled.