Air safety advocates say a GOP proposal won't mandate the collision warning system airline jets need

The NTSB says an anti-collision system called ADS-B In could have prevented the DC air crash. Heather Diehl/Getty Images A bill that would have implemented NTSB safety recommendations failed in the House. Opponents cited cost and security concerns with broadcasting aircraft positions to avoid collision. The bill's advocates say a Republican counter-proposal lacks the monitoring system pilots need. Lawmakers appear to be at an impasse after the failure of a bipartisan bill that would have ma...