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 planes?" The flight attendant asked, "Did your mother tell you to ask me that?" He said that she had.

With a clever grin, she said, "Tell your mother it's because Southwest Airlines always pulls out on time."