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AVIATION DEMAND FORECASTS FIGURE 2-22 AIRCRAFT DESIGN GROUP Source: FAA AC 150/5300-13A Change 1, Airport Design FIGURE 2-23 TAXIWAY DESIGN GROUP Source: FAA AC 150/5300-13A Change 1, Airport Design The 2010 Airport Layout Plan defined the current critical aircraft as a Boeing B737-300, which is a C-III-3 aircraft. At the present time, the largest and most demanding commercial service aircraft operated at the Airport is the Boeing MD-83 (D-III-4) operated by Allegiant Airlines, Bombardier Q400 (C-III-5) operated by Horizon Airlines (a subsidiary of Alaska Airlines), and the Boeing 737-900 (D-III-3) operated by United. In regard to AAC and ADG the MD-83 and B737-900 are the most demanding as D-III aircraft. For taxiway design, the Q400 is the most demanding as a TDG 5 aircraft. 3 In the future, the MD-83 is planned to be phased out of Allegiant Airlines fleet by 2020, and replaced by A320 aircraft. The Bombardier Q400 is also being phased out by Horizon and replaced with Embraer E175 jets. However, Alaska’s fleet transition is not expected to occur at EUG within the next 10 years, and perhaps not within the planning period. The transition to E175 equipment is strategically designed to 4 allow Alaska to better serve “long, thin routes” which are described as routes that are better served by jet aircraft but lack the demand necessary to profitably fill the airline’s B737 mainline aircraft. Because the vast majority of service from EUG by Alaska airlines are short haul routes, the Q400 is expected to remain the equipment of choice. With the discontinuation of MD-83 use by commercial airlines in the future, the existing and future critical aircraft for EUG are identified as the Boeing 737-900 and Bombardier Q400. The dimensions of these 3 “Allegiant Air’s MD-80 Plans Depend on Finding A320s,” Aviation Daily, April 14, 2016 4 “Alaska Air’s Horizon places big order for Embraer E175 jets,” U.S.A Today, April 12, 2016 EUGENE AIRPORT MASTER PLAN 2-32