I received the automatic $200 voucher email yesterday, which I really appreciated, especially as the inconvenience I experienced was mild compared to what others are reporting. But it would be nice to have the 20,000 Skymiles instead -- they'd be more valuable to me, I think.
Is it possible to have one's choice of either the voucher or the miles? I wonder if I should try to follow up with DL, and if so, through what channel (replying to the email I received?).