Deadly American Airlines-helicopter collision highlights concerns with crowded U.S. airspace

1. American Airlines jet crash near DC resulted in multiple fatalities. 2. The incident raises concerns over U.S. airspace congestion and safety regulations. 3. Airline executives advocate for air traffic control modernization. 4. Recent close calls heighten scrutiny on aviation safety measures. 5. This crash marks the deadliest commercial aviation disaster since 2001.