When was this? If only a couple of days ago, DL sometimes sends out an apology letter and DL $ voucher without any prompting on your part. I was once on a DL transatlantic from JFK booked in non-upgradable coach; mechanical problem - delayed a little less than 3 hours - far better than your experience. They upgraded most Medallions it seems (including my self ). I was quite happy at that point. Then, within about a week, I received an apology letter explaining exactly what the problem was with a 100 DL $. I was most impressed ... That's what I consider Simply Good Business!