What is the best strategy to use to get on an earlier ps flight only if I am able to get an aisle seat as a minimum, and hopefully an upgrade? I want to fly on any of the 4 earlier ps flights of the day. While I'd love to be able to upgrade, at a minimum, I want an aisle seat - and would keep my current reservation if I cannot accomplish that. (I'm happy to pay the $25 to confirm an earlier flight.)