My wife and I are familiar faces in the Centurion Lounge at LAS and the staff there all recognise us. It's a similar story in the Qantas First Lounge at LAX where my wife and I know / are recognised by a few of the staff. Pre-COVID there was one member of staff in the lounge at LAX who always seemed to be on when we were there and we'd always have a good chat.

I got quite chatty with some of the TSA agents at Fresno as I would be flying out of there every Sunday. On the BA side of things there was one CC (Zach) who seemed to be a regular on the 747 operated flights to and from LAS, and there was a regular CC on my flights to and from BRU too. The NCL lounge had a very small staff and so we'd recognise each other there too.

None of this was anything more than a "Oh, hello, nice to see you again" type of familiarity. There have been a few occasions where CC on one flight have been on our next flight - which leads to comments such as "We don't need to bother asking what you'd like to drink"