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2016 CBA Tentati ve Agreement Page 160 of 217 The formula for measuring the facility's sustained traffic index (Dt) is: Dt = 1+ (Cav2 / Cav1) The formula for deriving the facilit y's Traffic Count Index is: Dt x Wav1 = Traffic Count Index where: Cav1 is the average unweighted hourly count for the busiest 1,830 hours Cav2 is the average unweighted hourly count for the second busiest 1,830 hours Wav1 is the modified average weight ed hourly count for the busiest 1,830 hours. FLIGHT OPERATIONS COUNTED All types of flight operations at terminals are counted in computing the average weighted hourly count. All VFR and IFR aircraft arriving or departing an airport are counted, includ ing low approaches, stop - and - go or touch - and - go operations, practice instrument approaches, and missed approaches. All overflights which transit the terminal's airspace, VFR advisories, and other required special VFR (SVFR) services are counted. All typ es of flight operations that occur in En Route airspace and are handled by En Route controllers are counted in computing the average weighted hourly count. This includes: all IFR arrivals and departures within the facility's airspace, overflights, transiti onal overflights, oceanic and other over water traffic, practice instrument approaches, and VFR advisories. All the types of flight operations that pertain to CCFs are used to compute the average weighted hourly count. This includes: all IFR arrivals and departures within the CCF's airspace, overflights, transitional overflights, oceanic and other over water traffic, practice instrument approaches and VFR advisories. Note: Aircraft counts are determined through manual means, automation capabilities in co mputer system and additional automated calculation tools. Automated means are the best practical method of determining those counts considering operational workload impacts. WEIGHTING AND MODIFYING THE TRAFFIC COUNT TO REFLECT COMPLEXITY As pointed out e arlier, varying weights are assigned to different flight operations to recognize the difference in the complexity of the facilities related to the different operations, and the weighted air traffic count is further modified to recognize other factors which significantly influence the level of complexity of the facility. PART I – TOWER For each average hour of operation (i.e. the 1830 busiest hours divided by 1830):

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