Airstream seems to make some unannounced changes near the end of the year when some units get changes destined for the following year.As I recall, my 2003 was a very late build for that model year. It replaced a 2003 International that I had for maybe a year and a half. It may possibly have had upgraded axles. It was definitely titled as a 2003, though.
John W. Irwin
2005 Classic 28 "Sabre-Dog III"
2013 Silverado 2500HD Duramax/Allison LTZ
WBCCI #9632, TAC TX-10