I sat next to a JetBlue pilot on a flight once who said they ferry their A320s to the paint shop in New Mexico every 5 years for a repaint. 534 came in Feb 2008 and has factory paint. My guess is at most airlines, it would be due for a compete repainting. I'm sure we will fly it until all the white paint has fallen off and they have to spray paint "Spirit" on the side in blue.