I always get a kick out of the navy controllers here saying "kay-beck" for Q.
Originally, the last two numerals in the tail number coincided with the last two digits of the serial number. The first Cessna 180 off the assembly line was s/n 30000, N2800A. 53 models were 2800-series Alphas and 1600-series Charlies. The serial number / tail number relationship carried on for several years, although by the time the 1956 model 180's rolled out, it had slipped to being a couple digits off from each other. But they were still issued in series, for example most of the 1955 models I'm familiar with are 9300-series Charlies and most 56's are 7600-series Alphas. My buddy's renumbered 180 is N78xxC, which looks right but isn't part of a regular Cessna number series. FWIW Cessna's 1948 models were all Victors after which they generally used A,B, C, & D series tail numbers until the mid-to-late fifties.
