Washington CNN  —  A commercial plane and an Army helicopter collided, a regional jet rolled over on landing and a family of five was killed after a helicopter plunged into the Hudson River – all three incidents from the first part of this year add to the anxieties of the flying public. The crashes are among more than a hundred incidents this year, involving everything from commercial airliners to smaller, so-called general aviation aircraft often flown by private pilots. And it’s only April.