I had this happen shortly after SR went bankrupt and was being reborn via Crossair under the Swiss brand...
A mid-Janurary flight cashing in on Qualiflyer miles for GVA-BSL (the only C pax) connecting BSL-MAN...was the only C pax among 2 other pax on board an Avro RJ-100...it was a very quiet flight! a cabin crew ratio of 1:1 isn't bad