The new book "Fly by Wire" contends that Capt. Chesley Sullenberger wasn't the only hero involved in landing an U.S. Airways jetliner on the Hudson River last winter. Journalist William Langewiesche writes that the unsung hero is Bernard Ziegler, a French test pilot who talked Airbus into developing "pilot-proof" airliners. Langewiesche argues that the "fly by wire" automation on the Airbus A320 meant that gliding into the Hudson didn't require "unusual skill" by the pilots. But Sullenberger responded that the book "greatly overstates how much it mattered" that the plane was an Airbus and not a more conventional Boeing.