article_snippet.sent: One of the most important flight routes and the first to be completed, stretched across the US from the famous New York to San Francisco .
article_snippet.sent: The arrows started to be placed across the country, sometimes at 10-mile intervals, from 1924.
article_snippet.sent: In the summer of 1924, pilots stretched from Wyoming to Ohio and by the following year, The arrows had reached the famous New York.
article_snippet.sent: By 1929, The arrows could direct flights all the way across the width of America.
article_snippet.sent: the famous New York the famous New York San Francisco stretched from the famous New York to San Francisco, following the yellow concrete trail.