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DALLAS, April 23 /PRNewswire-FirstCall/ — MRO Americas — Southwest Airlines has performed nearly 1,500 Pratt & Whitney EcoPower engine washes since July 2006, saving more than 9 million gallons of fuel worth $12.5 million and reducing its CO2 emissions by nearly 90,000 metric tons. Pratt & Whitney is a United Technologies Corp. (NYSE: UTX) company. Southwest Airlines (NYSE: LUV) , the nation’s largest carrier in terms of domestic passengers, currently serves 65 cities in 33 states.