I have a flight booked to Burbank later this week. It turns out that my morning meeting got moved to the afternoon, and it looks like AS's schedule is down to 3 flights a day, the next one being 7 1/2 hours after my 8:10am flight. LAX works just as well for me, and has a lot more flights. Can a phone rep do a same day change for me with this terminal change? Are there any tricks to being successful with that? How about missing my flight and invoking the flat tire rule at SEA, will they be able to confirm me on a later flight to LAX? In that case, is it better to check in on-line and miss it, or not?