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.

#3 Avion is a Hungarian alternative rock band formed in the 90es. They describe themselves as "pubrock". The vocalist's voice resembles Nick Cave and Tom Waits.
Lineup:
- Kele Róbert - vocals, guitar
- Bombicz Gábor - guitar, vocals
- Fatuska Benjámin - guitar
- Oláh András - drums
- Bihacker Csaba - trumpet
- Nagy András - saxophone
- Fatuska Máté - bass guitar

#4 Is an electronic dance music musician named Christian Fuentes, who has releases on the Dangerbox label.
http://www.facebook.com/pages/Avion/148439258560717

#5 Avion was also the name of an slovak rock / pop rock band from the 80s.
Slovak band Avion was founded in 1986 and ceased in 1987 due to organizational reasons.
The band have performed also great musicians who were well known in Slovakia. Together they recorded several demos and home recordings. Although the band previously appeared on Slovak radio and TV, the album was never realized.
Here you can try some home recordings from the period 1986 to 1987: http://www.pavolhabera.info/Avion.htm
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Lineup:
- Fero Griglák - lead guitar
- Pavol Habera - vocals
- Peter Peteraj - guitar
- Martin Matyáš - bass guitar
- Pavol Kozma - drums
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Ďalší pokec z webstránky Paľa Haberu v slovenčine:
Po návrate z vojny v roku 1986 Paľo Habera a šéf kapely Fero Griglák založili skupinu Avion. Fero Griglák hral na prvú gitaru na ďalšiu hral Peter Peteraj, Pavol Kozma na bicie a Martin Matyáš na basovú gitaru a Paľo spieval. Kapela po muzikantskej stránke bežala výborne, avšak stroskotala na organizačno-produkčnej stránke. V rozhlase sú tri alebo štyri pesničky Spočítané máš, ktorá bola dokonca i v Triangli a Výpravca vtákov, ktorá sa dostala do hitparády 5 x P a ešte Majiteľ súkromných vzbúr. Textárom Avionu bol Daniel Hevier. Avion fungoval asi rok a potom sa rozpadol.
História skupiny Avion mala krátke trvanie, Kozma odišiel do USA, kde študoval na Berklee School Of Music v Bostone, Habera odišiel spievať k martinskej kapele Team a Griglák začal hrať s bratislavskou hardrockovou formáciou Pressburg, ktorá sa po tragickej smrti jej speváka, Karola Vilčeka rozpadla.


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