by Claudine Zap First, you could check in online. Then you could print out your own boarding pass. Now, Continental Airlines is testing a self-board option. Some travelers at Houston Intercontinental Airport can now come to the gate, swipe a bar-coded ticket, and walk themselves onto the plane. A story on USA Today described it as similar to riding a New York City subway (we hope, the only way): Once the ticket is swiped,