Originally Posted by
SK AAR
It is beyond me why you would change a nice 2-leg itinerary for a 3 leg itinerary (and with AA for the TPAC flight - to be avoided at all costs). Miles/points could have been sorted out with a ORC once you were in the US and the middle seat at check-in (most like an isle or window seat would be avaiable to you).
OP had a TPAC on AA to begin with and the UA flight, if had been rerouted close to departure, had a much higher chance of having no window / aisle.