NWA Cargo said it upgraded engines on five of its 12 747-200Fs as part of its EarthCares program. It switched out a mix of JT9D-7Js and -7Qs for a mix of -7Qs and -7Rs from former passenger aircraft, according to spokeswoman Kristin Baur. NWA expects to achieve a 5% improvement in fuel efficiency, saving 2.4 million gal. of fuel and 26,000 tons of carbon emissions per year. The freighter fleet currently consists of seven JT9D-7R-powered aircraft, three -7Qs and two -7Js. NWA Cargo also ...

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