Two US first flight covers for the inauguration of service for Airmail Route 88, 1967. One is postmarked St. Louis, one Airport Mail Facility St. Louis. Both are postmarked Baltimore on the back. Both covers are addressed. One has a bent corner, the other a bumped corner.

Most items under $20 ship in a first-class envelope with collectible stamps and with card stock  and, for loose stamps, glassine for protection; more expensive or heavier items may go Ground Advantage or Priority Mail. 

Check out my store for stamps, postal stationery, and covers (first day, space, flight, and more) from the US and worldwide! Most inventory comes from my historian dad's 65-year collection. He specialized in the US, Nepal, and mountain climbing but collected from all continents.