It's an interesting topic. I can't really answer Rudi's questions, as I checked in at GVA and am not sure what happened with bumping at ZRH. I suspect, as I said, people missed their connections due to fog delays. Looking back at the economy cabin gave an impression it was full, but there might have been a seat here and there. Are you suggesting that European carriers don't upgrade at all unless they really have to, and only then to status members?
For Airoli, I was wondering if you were travelling on off-peak special offers, or at prime time such as during the Summer. Sabena once upgraded me once on the plane. I had settled into what must be the best economy seat, and someone came along and unceremoniously chucked me out of it. I immediately moved, presuming I had made a mistake, but both our boarding passes shared the same seat number. On the strength of that strange occurrence, the chief cabin stewardess invited me into business.