CowboyRobot writes: "Last year, a Nigerian man boarded a plane from N.Y. to L.A. using an invalid ID and a boarding pass issued to another person. A week later he was caught again with 10 expired boarding passes. In response to this and similar events, the Transportation Security Administration has begun testing a new system at Washington's Dulles International Airport that verifies an air traveler's identity by matching photo IDs to boarding passes and ensures that boarding passes are authentic. The test will soon be expanded to Houston and Puerto Rico."
A method of solution is perfect if we can forsee from the start,
and even prove, that following that method we shall attain our aim.