"When one of our reservation girls says, 'Just a second,' she means it.  She'll put a card in what looks like a little adding machine, and push a few buttons.  In less than one second, a green light glows.  That means you've got a seat on the flight you want.  Absolutely no doubt about it.      It's all done with computers, so smart they make 6,000 calculations as fast as you can say TWA.  They keep tabs on every seat on every flight to every one of our 85 destinations here and abroad.      But there's one thing computers don't do.  They don't smile and thank you for calling Trans World Airlines.  We do."