So much for notions of membership. A US airline club used to be a members-only club not just an extra amenity to pay to add onto your ticket. You could access it as a member. In the old days when you didn’t need a same day ticket to clear security you could go wait in the lounge to meet an arriving passenger.
As an historical vestige of that some airline clubs would even let you request gate passes after 9/11 as a service to its members.