2021-2-20 · Gravel Kits: How Boeing 737s Could Land On Dirt Runways. Once upon a time, Boeing offered an optional ''unpaved strip kit'' for its early 737 variants. Available for the 737-100 and -200 from February 1969, the kit comprised a number of modifications that would allow aircraft to safely fly in and out of airports that only had unpaved runways.
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