“continuing to Houston International Airport where we spent the night at the Shamrock Hilton, not far from the airport. “
LOL
He would have come into Ellington Field and that isn’t very close to the Shamrock either.
He meant Hobby - that’s all there was back then. Also, the “Trans Texas” side of the airport means TTA, Trans Texas Airways, or, as we knew it then, TreeTop Airways.
(Long before there was “somebody up there who LOVEs you” - Southwest.)