Originally Posted by alanh

I don't know what the criteria for being invited is. Best you can do is make sure your e-mail preferences allow them spamming you. Also, if you never seem to get any e-mail, you might try a different e-mail address. I never got marketing messages (like the GS scorecards) at my main address. Once I added a Gmail address as an alternate, I started getting them there.

Generally, competitors to the inviter are not available as redemption options. So if you were invited by another airline, you aren't going to get DM. Hotels, though, usually do. I signed up from a Hilton invite. It allows redemptions on a lot of airlines, but Hilton is the only hotel.