[csomar]

This comes to mind: https://www.youtube.com/watch?v=qhxlZC8BZJ4

This is just US insanity, though. The rest of the world has business -> economy (split into three groups by seat number)

[Semaphor]

IME (Germany, Dubai, South Africa mainly) it’s First Class, Business, Platinum members (because none of those groups have enough members to board only those), then economy, but split into groups depending on plane size, a typical emirates flight has 4-5 groups by seat number.