ADS-B enables increased capacity and efficiency by supporting:

• Better ATC traffic flow management
• Merging and spacing
• Self-separation or station keeping
• Enhanced visual approaches;
• Closely spaced parallel approaches;
• Reduced spacing on final approach;
• Reduced aircraft separations;
• Enhanced operations in high altitude airspace for the incremental evolution of the "free flight" concept;
• Surface operations in lower visibility conditions;
• Near visual meteorological conditions (VMC) capacities throughout the airspace in most weather conditions;
• Improved air traffic control services in non-radar airspace;
• Trajectory-based operations providing a gently ascending and descending gradient with no step-downs or holding patterns needed. This will produce optimal trajectories with each aircraft becoming one node within a system wide information management network connecting all equipped parties in the air and on the ground. With all parties equipped with NextGen equipage, benefits will include reduced gate-to-gate travel times, increased runway utilization capacity, and increased efficiency with carbon conservation.
• Use of ADS-B and CDTI may allow decreased approach spacing at certain airports to improve capacity during reduced-visibility operations when visual approach operations would normally be terminated (e.g., ceilings less than MVA +500).
• ADS-B In Requirements
• ADS-B Out will be required in the following airspace:
  • Class A, B, and C airspace
  • Class E airspace areas at or above 10,000 ft MSL over the 48 states and DC, excluding airspace at and below 2,500 ft AGL
  • Airspace within 30 nautical miles (nm) at certain busy airports from the surface up to 10,000 feet MSL; airports listed in appendix D to part 91.
  • Above the ceiling and within the lateral boundaries of a Class B or Class C airspace area up to 10,000 feet MSL
  • Class E airspace over the Gulf of Mexico at and above 3,000 feet MSL within 12 nm of the coastline of the United States

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