In January, the deadliest US airline crash in nearly 20 years killed 67 when American Airlines 5342 collided with a Black Hawk helicopter over the Potomac — a jarring break from an era of near-perfect commercial flight safety. Even before the collision, concerns were growing. One year before, a door blew off an Alaska Airlines jet mid-flight, and more recent incidents, from a plane flipping in Toronto to a near miss in Chicago, have lingered in the public consciousness. Is flying still as safe a