I suppose it might if you were flying charters in a 152, but no company I worked for ever allowed consideration of physical size as a factor in the employment process (although a few larger airlines do). Our view was that, if the CAA gave you a medical, and you could physically fit in the aircraft, that was all we cared about.
Having said that our smallest aircraft was a 70-seater, so size and weight were not issues.
I'll bet it's illegal in Australia to discriminate on the basis of size or weight though...
