Detour "US"-119?

Within only a few months of shedding its anonymity, WIS-119 seems to be aspiring to a higher level!  Not really, but this detour sign at Howell Avenue (WIS-38) and College Avenue (CTH-ZZ) has the detour for the Airport Spur mis-labeled as a US highway.  Mark W. Hintz photo, 09/09/07, Oak Creek WI