Perhaps contrary to popular belief, several of the airplanes in this article have experienced changes in the last quarter century. Cessna's Skyhawk, the world's most popular airplane until a few years ago, has undergone some upgrades since its revival in 1997. Though Cessna switched to Lycoming engines with the reintroduction of the Skyhawk, Skylane and Stationair, the Skyhawk was offered in two hp configurations: 160 hp on the 172R, and 180 hp on the 172S. Performance differences were minor, though the S version of the Skyhawk obviously benefitted from slightly better climb and about one knot more cruise. Another major improvement in the Skyhawk was the Garmin G1000 glass-panel display. Today, Cessna has dropped the 172R and produces only the 172S.
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