Originally Posted by
Dan6681
I'm pretty sure you can only move up within a certain time frame in regards to your originally purchased flight.
Off the top of my head I think you can only leave - 4hrs or less.
From the
page:
Stand-by fee waived
Move up to an earlier flight for free. We waive the $25 standby fee for our Platinum Preferred customers who want to move up to an earlier flight on the same day of travel.
I just wasn't sure if it is also for Shuttle flights.