I'm looking into flying from NYC to FCO or MXP in middle of September. Looking at ef right now, I don't see any upgrade inventory available on a couple of dates I looked at for either cities. I was thinking of using miles + copay for upgrade. Just wondering if anyone have ideas on what the likelihood of 2 seats becoming available is during that time. So looking at Sep 8 to 15th. Would one be more likely to become available than the other one?