On various airlines I find usually full Y. I was kicking myself earlier this year for not having my DL skymiles number or card handy when bumped from LH to AF (the FFPs I use more regularly I know my numbers off by heart but not DL). Since then I have taken Randy's advice and have a small card with all my numbers on in my wallet, just in case.

I had a recent bump from UA to UA. Will check when it posts what it went to or if it stayed the same class as originally booked.