There are reports in another aviation forum that some early flights on the Glasgow service had fewer than 20 passengers but the lateness of booking availability must be taken into account, and the fact that Flybe on its GLA and EDI routes averaged easily in excess of the 32/33 passengers required to reach a 65% load factor for CityJet means there is no real reason to believe that the airline won't achieve this particular target.
Should also consider the time of year, the worst for any airline, Cityjet were brave to start the service when they did. I would of waited until March.