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Show Milestone in Transcontinental Air Service C t-' - it- , - f' ' ' ' ' - ' i At -r , if V ' " i With inauguration of 15Ms-hour service from coast to coast by the United Air Lines, the evolution of transcontinental trans-continental air service in the past decade is pictured above. 1 Pioneer, single-engined mail plane, carrying carry-ing two passengers, which started first schedule ii 1927. 2 Modern air-conditioned mainliner, equipped with ;wo' 14-cylinder engines with a top speed of 212 miles an hour. |