An on-air helicopter crash killed journalist Eliana Moreno and pilot George Marciniw, shaking LA’s news traditionThe whir of news helicopters flying overhead has long been a familiar soundtrack to life in Los Angeles – and the footage they gather of high-speed chases, wildfires and celebrity sightings a fixture of local television.For nearly 70 years, Angelenos have gotten their news from “the eye in the sky” – from scenes of OJ Simpson’s fleeing white Bronco, the 1992 LA riots and even Madonna’