@SFOMuseum Instagram Posts Tagged flyingthemainline This is SFO Museum's archive of the @SFOMuseum Instagram account. There are 25 posts and this is page 3 of 3. See all the tags or all the Instagram posts that have been archived so far.

United Airlines traces its origin to the mid-1920s, with the establishment of four airmail routes that would later become the backbone of United’s route system. This image was posted on July 08, 2017. #united #unitedairlines #themainline #avgeek #aviationhistory #flyingthemainline #airmail