This is a long post (graphics), but one some of you may find educational.
In 1982, two (maybe more) commercial airline services, here Western Airlines, opened a service of private flown mail between points served by the airline with 48 hour delivery guaranted anywhere in the zip codes show below. The fee was $1.00 in addition to the regualr USPS postage rate.
Below are the 4 Series items, both envelope and mint item. The last image is the zip code delivery chart.
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