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The development of techniques employed by the airlines in overcoming the problem of clear air turbulence is outlined. Improvement in transport aircraft brought new sets of challenges in this area which were overcome by applied meteorological studies conducted by the airlines and assisted by military and government research. A distinction is made in the methods of bypassing the turbulence regions caused by wind shear and those caused by the mountain wave. A new study on mountain wave turbulence evasion showing considerable promise is discussed. Recommendations are made on methods for keeping pace with an increasing exposure to this important operational problem.