When a new invention becomes a success, the natural instinct of the businessman is to associate your product with it. That probably explains these products:

The name Clipper was a trademark of Pan Am, but apparently the laws regarding infringement were a lot more lenient in those days. Pan Am and the San Francisco brewery that made this beer are both long defunct, but one can still imagine the locals watching takeoffs from the airbase in Oakland, sipping a beer and wishing they were aboard.