It seems that the correct spelling for the line of school buses should be without the hyphen. (All on the site are currently hyphenated).
http://www.imcdb.org/vehicle_136516-Blue-Bird-All-American-FE.html
Wikipedia uses the hyphen, but that does not make it reliable. I am under the opinion we should go with the manufacturer's spelling and change from:
http://www.imcdb.org/vehicles_make-Blue+Bird_model-All-American.html
to:
http://www.imcdb.org/vehicles_make-Blue+Bird_model-All+American.html