I am with mcoyle. I took my last flight on DL in early Feb. No more!! I had a few AM runs and also got 1/2 MQM's for those flights. The bad thing is that AM is doing the same thing with it's Club Premier. I guess I have to go fly MX when in Mexico. As far as the rest, CO takes me everywhere I need to go in Mexico , Central and South America and I love the unlimited upgrades, even though I only made lowly Silver because of a pesky contract with AA at my employer's.
I am a big fan of BF on IAH-GRU: better than UA, AA and DLcrap!!!
Keep on with CO guys!!!
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Do not sit in the back.