Air travel worries also. Ron claiborne with the story from Laguardia Airport tonight. Reporter tonight, americans on edge, heading into some of the busiest travel days of the year. This plane diverd because Officials Say three people were behaving strangely. The flightht headed to los angeles. The passengers taken off the plane, questioned, and then later allowed to get on a different flflight. And the fbi said it had no specific or creditable investigation on an attack. If it can make people afraid, they are winning a victory against the country theyre targeting. Reporter in new york city, hundreds of responders taking part in an exercise. Today, president obama vowing that fear of being targeted by terrorists will not become the new normal. They cant beat us on the battle battle battlefield battlefield, so theyre trying to make us afraid. And i wont let that happen as president. Reporter and many travelers seeing a much heavier presence from police,or weeks and probably months to com