Originally Posted by
davetravels
Or . . . .
When you tip a SkyClub bartender $50, you get Silver. $100 tip gets you Gold. $250 tip gets you Platinum, and, <a mere> $1000 tip gets you Diamond. If you tip with a Delta Amex, you get a 20% discount, of course.
However, if you are a U.S. citizen residing in a foreign nation which has no SkyClub (like, for example, Israel) it would be sufficient for you to prove that you paid the above amounts in American income tax.