A mother and her son were flying Southwest Airlines
from Kansas City to Chicago. The son (who had been looking out the window) 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 (who couldn't think of an answer) told
her son to ask the stewardess.

So the boy asked the stewardess, "If big dogs have baby dogs and big cats have baby cats, why don't big
planes have baby planes?"

The stewardess responded, "Did your mother tell you
to ask me?"

The boy admitted that this was the case.

"Well, then, tell your mother that there are no
baby planes because Southwest always pulls out on
time. 
Now let your mother explain that to you.