There are at least 4 bands with this name. #1 Avion is Steve Bertrand (vocals), Jamie Wollam, Ben Hazlett, Josh Dunahoo (guitars), & Joey Clement.
Side note: Their music has appeared on several tv shows, including NBC's Scrubs, and has received national acclaim. #2 Avion was also the name of an australian christian rock band from the 80s. Their lead guitarist and singer Randall Waller has toured with Bonnie Tyler and Shania Twain.

Read more about Avion on Last.fm.