The Port Authority unveiled newly outfitted AirTrain cars in a ceremony today honoring the young winners of the "What I Like About New York" poster contest. The 5th through 8th grade winners will have their artwork displayed aboard AirTrains and received a $50 gift certificate for art supplies form the Aviation Development Council. By the end of next month, The Port Authority hopes to have all 32 AirTrain cars redone with the new upholstery and flooring. More than 1,312,800 paid passengers rode the train during the first four months of 2007, a 15 percent increase from the same period last year. -- Justin Rocket Silverman