A real shame about belair, another small airline looks like it will bite the dust. Sounds a bit like Monarch Airlines over in England, but they got rescued. I haven't seen belair branded planes around at ZRH for a long time. Wasn't there something similar called Balair CTA a few years back, in Swissair days?
From an airberlin perspective, there was very little customer awareness of the belair brand, apart from a small logo as you boarded the plane (my ZRH-DUS and vv flights). The whole interior had been completely fitted with the airberlin look. Even the safety card, which nearly always has the operating carrier on it, was airberlin branded. The crew always seemed pleased when I acknowledged there as a belair team.