>> reporter: these flight attendant and airport workers training to recognize sex traffickers among the thousands headed to the super bowl. criminals transporting women and children to new york against their will. not for the biggest weekend in football, but for the biggest weekend in prostitution. >> any major event where there's going to be a lot of men, a lot of money and a lot of alcohol, there's an increase in demand for commercial sex. >> reporter: in fact, the number of prostitution ads in new york websites jumped by 50% over the weekend, expected to triple by sunday. a counterattack, new billboards in times square, madison square garden and videos played in major train and bus stations. >> it's time to open our eyes. >> these are places we know that victims end up. they will see these billboards. they'll know someone's out there to help them. >> reporter: the training works. in boston a child prostitution ring smashed. 86 children freed after an airline worker noticed a man traveling with two crying children. >> we've caught a dozen.