I'm looking for avenues to upgrade 5 one-way coach fare tix on AA. AA says 15,000 miles needed each. I need 2 more sets (30,000 total). It's a family trip in June and want to reticket at the upgrade if possible, to lock-in. I obviously don't fly all that much and have used up all ideas such as signing up for new credit cards etc. Suggestions?? thanks.