That's pretty much the way Airstream does their parts business. Everything has to be ordered through one of their authorized dealers. I guess that is part of the dealership agreement.
The only exception is if you are physically at the Airstream Factory Service Center in Jackson Center, Ohio.
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with HAHA
2005 Suburban 2500 Quadrasteer (Olivia) & 2011 Silverado 3500 (Fred) with Outfitter Truck Camper (Ethel)