>> bret: you may notice changes the next time you go to the airport. a new terror alert system has gone online with two just two categories and no colors. you will soon have more clearly defined rights as a passenger. correspondent doug mckelway look at the new rules and what prompted them. >> in 2009, passengers on a flight from houston to minneapolis were stuck on a plane for more than six hours after it was diverted around a storm. >> no food and water and ran out of everything. >> upon landing they were prohibited from leaving the plane because airport security left for the night. stories like that prompted the department of transportation today to extend passenger protection. four-hour limit on tar mac delays in effect for domestic carriers will be imposed on the foreign carriers in the u.s. in addition, passengers who lose luggage will now be