A United ad showing pampered customers had to be pulled after it prompted laughter

United/YouTube Yet again, a costly ad campaign is backfiring. Every time the Tribeca Film Festival (April 19-30) ran the sleek promo spot for United Airlines' super-posh Polaris International business class (see below), New York audiences erupted in jeering laughter. Clearly, United still has PR repair work to do, following the viral video of a man being pulled bleeding off a plane after refusing to give up his reserved seat. So Tribeca and the airline agreed to pull the ad after three days of l...