A heart-stopping near-miss over Southern California is now fueling a sweeping federal crackdown on how aircraft share the skies.Earlier this month, a plane and a helicopter came dangerously close to colliding near Hollywood Burbank Airport — and officials say it’s exactly the kind of incident that can’t be ignored anymore.According to the Federal Aviation Administration, the March 2 scare unfolded when a Beechcraft 99 was cleared to land just as a helicopter drifted into its final approach path.