The crowd in this photo had gathered on the roof of the Los Angeles Post Office Terminal Annex on the outskirts of downtown LA to watch this Los Angeles Airways helicopter take off. October 1, 1947 was a special day because it was the inaugural flight of what was soon to become a twice-a-day mail service shuttling between the main post office and LA International Airport, thus cutting down the time it took for airmail to reach the letter boxes of Angelenos. It’s a good thing nothing went awry because that’s a lot of people standing not too far away!