In 1964 I flew the Baltimore (BAL back then) to Washington National (DCA) flight listed- a DC6B-- to connect to an EAL Lockheed Electra to North Carolina.

I was an unaccompanied minor and a UA agent met me at the gate in DCA and took me to the UAL employees lounge where I waited until it was time to board the Eastern flight. I think I may still have the ticket somewhere.