I'm flying tomorrow morning from Philly to Palm Springs, by way of Denver. Please note that my tickets are through United, but the flights are USAirways and USAirways Express, if that makes a difference.
It's a nice time of year to fly, not much going on. There is some weather moving through the western part of the country but it should be well avoided. I'm seeing very few reports of bumps here and there as is always typical, but there just isn't much going on, so your flights should be pretty good. Enjoy.