Baby Planes

A mother and her young son were flying Southwest Airlines from Kansas City to Chicago. The little boy had been looking out of the window. He turned to his mother and asked,
“If big dogs have baby dogs, and big cats have baby cats, why don’t big planes have baby planes?”
The mother couldn’t think of an answer. She told her son to ask the flight attendant.
The boy went down the aisle and asked the flight attendant, “If big dogs have baby dogs, and big cats have baby cats, why don’t big planes have baby planes?”
The busy flight attendant smiled and asked the boy, “Did your mother tell you to ask me?” The boy replied, “Yes, she did.”
“Well,” said the flight attendant, “you go and tell your mother that there are no baby planes because Southwest always pulls out on time. “Have your mother explain that to you.”