My takeaway from this thread is that there is no real rhyme or reason, other than an attempt to "surprise and delight" -- people who say they have low MQDs have gotten it, people have gotten it on long connections, etc. There are probably weighted factors like status and connection time but there just aren't that many cars and there are a lot of travelers, so you really can't count on it in any predictable way, just enjoy it if it happens
