Share Share on Facebook Share on Twitter Pinterest Email René René de Lambert is a contributing writer and the founder of RenesPoints. He is an avid Delta and SkyTeam flyer who has held Delta’s top Diamond Medallion status for many years and flown millions of miles. Website 1 Comment Greg 7 years ago Reply I didn’t realize we had Northwest to blame for Delta’s 3 tier award chart. But that all makes sense…the NW stinginess is what has infected Delta. Never quite understood all the love for WorldPerks, and I was a WorldPerks elite for many years. The domestic upgrades were really reliable but that was about it. Everything else was a lot worse than United, Continental, or American. Write A Comment Cancel Reply Save my name, email, and website in this browser for the next time I comment. Notify me of new posts by email.