A mother and her young son were flying British Airways from London to
Sydney. The son, who had been looking out the window, turned to his mother
and said, "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?". The
boy said that she had.
With a clever grin, the flight attendant said, "Tell your mother it's
because British Airways always pulls out on time."