US SB2503

Requires all aircraft currently mandated to have ADS-B Out equipment to also be equipped with ADS-B In technology by December 31, 2031, providing pilots with awareness of other aircraft locations and traffic advisories

Narrows the "sensitive government mission" exception for ADS-B Out transmission requirements, excluding routine flights, non-classified flights, and proficiency flights, while requiring monthly congressional notification of exceptions used in Class B airspace

Mandates FAA safety reviews of military, law enforcement, and civilian rotorcraft operations near Ronald Reagan Washington National Airport within 120 days, followed by reviews at other Class B, C, and D airports

Requires the Army Inspector General to audit Army aviation coordination with the FAA, pilot training standards, and ADS-B Out usage following the January 2025 helicopter collision near Reagan National Airport

Establishes an FAA Office of FAA-DOD Coordination and requires information-sharing agreements between the FAA and military departments to improve aviation safety data exchange