Pull out in time. A mother and her son were flying Southwest Airlines from Oakland to Kansas City. The son, 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 couldn't think of an answer, told her son to ask the flight attendant. So, the little boy asked the flight attendant: ""If big dogs have baby dogs and big cats have baby cats, why don't big planes have baby plan…