I'm a stamp collector during my leisure time and often add to my collection through an online (but local to MSP) monthly auction site. Every once and a while they offer lots of all sorts. In this month's auction there are several lots of airliner postcards - in quantities in the thousands. There are also lots featuring first flight and airport dedication covers. I am not associated with the site (only as a buyer) but thought this crowd might be interested in what is being offered. It starts at lot 248.

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Cheers,
Pogopossum