A girl is on an airplane with her mom and asks her, "If big dogs have baby dogs, and big cats have baby cats, then why don't big planes have baby planes?"
The mom smiles and tells her daughter to ask the stewardess. The stewardess comes over and the the little girl asks her the same question she asked her mother.
The stewardess asks the girl if her mom toll her to ask her and the little girl replied "Yes." Then the stewardess says "Well that's because Southwest Airlines always pull out on time!"