NEW YORK -- Bill Feehan was so knowledgeable about the New York City Fire Department's operations and history, colleagues say, he would have been the one leading its recovery had he survived the attack on the World Trade Center.Feehan, the department's first deputy commissioner, was the highest-ranking New York City fire official killed on 9/11.“Chief,” a new documentary about Feehan airing on public television stations and in-person screenings around the 20th anniversary of the attack, is part