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today of the basis for the rule. These changes deserve careful analysis and review now.

MATERIAL INTERVENING
DEVELOPMENTS SINCE
1959 IN THE AIR
TRANSPORTATION INDUSTRY

8. In 1959, when the rule was formulated, the nation's airlines were deeply concerned with the problems of large-scale transition from piston to jet powered equipment. The most senior pilots of the airlines were, as the Administrator recognized, transitioning from piston equipment to the faster, more powerful, aerodynamically novel jet aircraft, which were to operate in a different, more critical environment, and which had to be operated more closely to operating specifications than their predecessors. Little airline experience was available respecting the problems which might result from the transition in such large numbers of the nation's senior airline pilots. There may then have been some apprehension that the piston-jet transition by senior captains in large numbers might raise some peculiar problems associated with the age at which the transition occurs.