Virgin Blue

A Mother and her young son were flying Virgin Blue from Brisbane to Melbourne. The boy (who had been looking out the window) turned to his mother and said “If big dogs have baby dogs and big cats have baby cats, why don’t big planes have baby planes?” The Mother (who could not think of an answer) told her Son to ask the flight attendant.
So the boy asked the flight attendant the same question. The Flight Attendant responded, “Did your Mum tell you to ask me?” The boy admitted this was the case.
“Well then, tell your Mum there are no baby planes because Virgin Blue always pulls out on time. Ask your Mother to explain that to you.”