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 australianchristianrock band from the 80s. Their lead guitarist and singer Randall Waller has toured with Bonnie Tyler and Shania Twain.