My gosh....altho a born Yank, my parents are from Germany, my grandparents still live in Germany, I spent almost every summer (school holidays) in Germany, I speak fluent German.........and I have no idea who most of these folks are.

Truly sad for me!
I sat one row in front of Steffi Graf and her baby F/C SFO to FRA. They live in the Bay Area.
Sat across the aisle from Beverly Sills about 20 years ago.
LaToya Jackson (friendly) on a LHR to FRA flight and 1 year later Janet Jackson (snob) from BER-LHR.
We were on Christmas holiday 2 years ago.....Leonardo DeCaprio in front of us LAX-FRA. Almost every staff came to greet him, most asked for autographs. Elderly man next to him finally stuttered....."Who are you?"
Many other sightings, but on other airlines.