I collect them, since I remembered buying them in airport shops as a kid in the 70's...they are available on eBay, sure...but some of my favorite treasures I have found in Salvation Army stores and Goodwill shops across the country. I am still wanting to fly down to MIA
and look in the used stores there, since that is where National, Eastern and Pan Am had their hubs. Should be an airline-collector paradise!
Btw, 2 of my favorite bags I bought when DFW
first opened in 1974, with Braniff International emblazened on the sides!