Only twice. Once at 10 million and one more time at about 15 I think. Now that I think about it ,could have been at 17 million. It's ORD GS that always makes a big deal of it. They are the best! My second family! Got a great reaction on the 10 million flight, it was a party all the way from LAX to Chicago. They had a cake and poured Veuve for everyone on the flight!. Even when I wear my 17 million shirt ,I think people think I bought int in a novelty store. I get the biggest thrill when ORD GS celebrates with me in the lounge every million with a delicious cake,bottle of Veuve and hugs from all my friend in that department. As far as what flight I will be celebrating 18 million,I will know for sure in the next week or so and will post it here. I think I am less than 40,000 to go.