Sadly, I lost my dad, too, in 1993... He wasn't a big fan of Led Zep, but respected that I was/am. He was a pilot and into real estate.
One of my best friend's (here in Atlanta, a sound designer and a big Zep fan like most of us around here dad was also a pilot, who happened to fly JP, RP, Bonzo, JPJ and their wives up to NYC for the premiere of TSRTS in 1976 on a rare night.
R