I was looking at bidding for an upgrade on Brussels Airlines (MAD-BRU) but the minimum bid level for Biz&Class is set far too high for a short European flight. Maybe I will try for Flex&Fast (which I believe is a sort of premium economy with full service) if they allow me to bid at a more sensible level. I have been able to find any experiences with SN upgrades here ... has anybody here managed to successfully bid on SN?