article_snippet.sent: Airmail in the US began as early as 1911, with the first official flight departing Petaluma, California, and arriving in Santa Rosa, California.
article_snippet.sent: Following World War One, the US Postal Service began to use surplus war planes for mail delivery and many were flown by former army pilots.
article_snippet.sent: The arrows define a moment in history at the beginning of the 21st century when the US Postal Service began delivering air mail .
highlights_snippet.sent: The arrows directed the first air mail planes across the US to deliver post .
  