I have a miles ticket on 6/18 ogg-dfw flt6 and have seat 23E. On the AA website under "view avail seats" 22G (isle)is avail, it is a preferred seat but i would gladly pay the $70. to get that seat. Was not given any option to purchase it at booking and when i check seat avail under my flt it does not show avail. Any way i can pay the $70. and get that seat?