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Get tickets to see #The1975 here!

from Mental Floss

Before fax and e-mail, folks sent their documents via airmail. The postage rate for airmail was higher than regular and based on weight, so envelopes were made of thin paper. Some letters were written ON the inside of the envelopes! They were always marked with a red, white, and blue border so they stood out during the PO sorting process. The USPO discontinued domestic airmail as a separate service in 1975 and simply shipped all mail by plane; international airmail rates were ditched in…