NTSB

Measure includes collision-mitigation requirements, changes for military aircraft operations and limits on some ADS-B data use.

Investigators said the fire truck involved did not have a transponder, and a stepped-on radio transmission remains under review.

NTSB reviews runway alerts, staffing and ARFF response at LaGuardia.

Texas senator says discussions with defense officials continue following House defeat of air safety measure.

Investigators outlined the events leading up to Bell 407 accident during Flagstaff shooting response.

Former on-scene investigator in major aviation accidents says he received no explanation for termination.

Final NTSB report on a Pennsylvania GA-7 crash traces a familiar chain of events.

Board calls for mandatory ADS-B In equipage after DCA midair.

The NTSB warns first responders about the hazards of ballistic parachute recovery systems at crash sites.

Measure on ADS-B equipage falls short of two-thirds threshold.