A young mother and her four year-old son were taking a trip on Northwest airlines. The little boy watched intently out the window then turned to his mother and asked; "If big horses have baby horses and big dogs have baby dogs, why don't big planes have baby planes?"
Somewhat embarressed the woman suggested he ask the flight attendant.
When she came around he did just that. She looked to the boys mother who hid her face in a book pretending not to notice.
"Did your mommy tell you to ask me that?"
"Yes, she did." said the little boy.
"Well I don't know about other airlines, but we don't have baby planes because Northwest always pulls out on time. Now ask your mommy to explain THAT!"