Hello,

I did a search for this question but did not see an answer. I will be flying ORD-IAD-LHR and back via UA metal. I am UA 3P and BD Gold. I was wondering: putting in which FF # will give me a higher chance of an op-up? I have ~60k UA miles & ~25k BD miles & don't really care w/ which program I'd end up getting miles for these flights.

I know an op-up is not something I should expect but I'd like to maximize the probability of one if I can. Thanks!