Abstract
Since the deregulation of the airline industry in the USA in 1978, major carriers have increased hubbing operations in order to improve cost-effectiveness. This study examines changes in nodal accessibility of air transportation since deregulation. The data from origin-destination surveys of airline passenger traffic in 1970. 1980 and 1989 among 84 cities in the USA are analysed. Comparisons are made between the pre- and post-deregulation periods in the spatial pattern of intercity airline traffic. Hypotheses about the effects of deregulation on nodal accessibility are tested in multiple regression analyses. The distribution of changes in nodal accessibility between 1970 and 1980 illustrates a clear southwest-northeast pattern. The trend was stabilized in the post-deregulation period. The results suggest that the increased hubbing operations since deregulation have not enhanced spatial concentration of nodal accessibility.
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