Abstract: | The transition to deregulation of the U.S. air transport industry began in 1976. In this paper we measure total factor productivity growth of the airlines for the first five years of the transition (1976–1980) and compare the performance with that of the preceding years. We find that productivity growth accelerated from 2.8% per year to 5.1% per year. An analysis of covariance model with individual airlines as observations leads to the conclusion that for the trunk airlines nearly all of the acceleration can be explained by increases in output and load factor and decreases in the growth of capacity. For the local service airlines, however, less than half of the acceleration may be so-explained. |