Some airlines have returned to using real glassware and silverware in first class, rather than plastic or paper, he noted.

NPR: TSA To Allow Small Knives, Bats, Clubs On Planes

Mr. Nulty has a collection of more than 400 airplane models plus old ads and posters, TWA first-class menus from 1960s and paper dresses worn by TWA flight attendants.

WSJ: Airline Collectibles Take Flight

Every time someone decides to stop receiving a paper bill, 24 pieces of First Class mail per year disappear forever (the bill, and the payment, each 12 times per year).

FORBES: First Class Mail is Doomed. Get Over it.