This past Monday, I flew FLL-EWR and had something interesting happen at the FLL club. When I gave my lifetime membership card and ID, the agent said she had something for me and gave me a generic "congratulations on reaching this milestone" card. Handwritted inside it was a note thanking me for being a member of the "mileage program" for 15 years. I've got to give the people of UA credit for going out of their way to recognize a milestone that I wasn't even aware I was hitting. This made me feel like a valued customer.