Singapore Airlines always on time?

From My InBox:

A mother and her young inquisitive son were flying Singapore Airlines from
Singapore to New York. The son (who had been looking out the window) turned
to his mother and asked, "If dogs have baby dogs and cats have baby cats,
why don't planes have baby planes?" The mother (who couldn't think of an
answer) told her son to ask the pretty flight attendant.

So the boy dutifully asked the flight attendant, "If dogs have baby dogs
and cats have baby cats, why don't planes have baby planes?"

The flight attendant asked, "Did your mother tell you to ask me that?"

The little boy admitted that she did.

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