Well, a mailbox at TWA is hardly "doxxing", but is this a real stewardess, and not a model playing a fictional stewardess? I wonder what kind of junk mail you got for writing this person.

I imagine it’s so much cheaper (especially back then) to print out a couple hundred copies of a few different form letters and send them out based on received inquiries.

And yeah totally real persons in commercials, just like Santa.