If I received an email from Delta after hitting 3MM I missed it. The crew on the flight had no idea. I could select the gift on the website but that was it. I am still disappointed that Delta didn't do something to improve the value for hitting 3MM when they added the Diamond level. I went from the middle to below middle as a lowly Gold. They could add some additional upgrade certificates as an example.

It is one reason I moved much more of my travel to Alaska. My father hit 1MM on them and they had cake and balloons at the gate prior to departure.