next time be aware that ATPL is Airline Transport Pilot License " AIRLINE TRANSPORT " so if their are no large transport aircrafts there is a prob !!
First of all the A in ATPL stands for AIR and not AIRLINE and second I am an ATPL pilot, I have flown for an airline, doing what would be called "part 121" in the US or "RPT" in Australia and the aircraft (not aircrafts) I used were not that big... actually there is an airline in the US using single engine piston airplanes.
Hmmm... maybe the "prob" is when somobody wants to give a lecture without knowing the subject