Supersonic flight is making a comeback decades after the Concorde. But one big hurdle remains

By Jacopo Prisco, CNN (CNN) — The skies of Oklahoma City roared for six months in 1964 as military aircraft intentionally rattled the population below with a daily barrage of thunderous sonic booms. It was a controversial test — the consequences of which have lingered to this day. The booms — 1,253 in total —