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Chapter 3 | Past performance of air services on regional air routesFigure 3.7 Regional air routes, by flight frequency, 1984 to 2005(a) Air routes with an average of at least three return flights a week and air routeswith an average of less than three return flights a week600500Number or air routes400300200100(b) Air routes with various frequency groupsNumber of air routesSource:0500450400350300250200150100500198419851986Average of less than three return flights per week1984198519861987198819891990BITRE time series estimates.1991Once a week or lessTwo to four return flights per weekMore than four return flights daily19921993199419951996198719881989199019911992199319941995199619971998199920002001200220032004Average of three or more return flights per weekFive to six returns flights per weekOne to four return flights daily200519971998199920002001200220032004200569