NEW YORK - (KRT) - The widow of a Gulf War veteran aboard doomed United Airline Flight 175 revealed for the first time yesterday that passengers tried to stop hijackers from crashing the plane into one of the Trade Center towers. "I might have to hang up quickly, we're going to try to do something about this," Brian Sweeney reportedly said in a cell phone call to his mother. "Okay," Louise Sweeney said. "Do what you have to do." The account was related yesterday to the Daily News by Sweeney's widow, Julie, and has never before appeared in print. Until...