Most of my travel (boasting here) as I've wandered my way around the planet, has been in 1st class. Yes, I know. Company expense account. My company. I flew so often with Qantas that I knew crew on the routes. Nearly always in the cockpit for take off and landing.
I was in 1st once, the steward walked in and said "hallo Andy", followed by the flight crew who said Hi too as they marched past to the cockpit.
Captain stops and says "Andy, jump seat for Take Off?". The only other customer in 1st flips out. "Do you own the fucking airline or what?".
"Nope, just fly a lot".
Concorde
Once flew New York and back just to have breakfast.