12.19. J. Cigliano (“Price and Income Elasticities for Airline Travel: The North Atlantic Market,” Business Economics, September 1980) estimated the price elasticity of demand for regular (full-fare) travel in coach class in the North Atlantic market to be He also found the price elasticity of demand for excursion (vacation) travel to be about Suppose Transatlantic Airlines faces these price elasticities of demand, and that ?