Originally Posted by
BrianMinn
In the past few months (but on NW), I had done the M class and before final purchase was asked if I wanted an upgrade for miles. Obviously I chose this, as that was the purpose of choosing M class. I thought I had seen this on the DL site, but now when I am about to get a ticket, it is not there.
I know it's a pain, but get on the phone and make the reservation with an agent. Make sure to ask if you will be able to use miles to upgrade before you finalize the purchase. Even if you book online, you'll have to call put the upgrade through.