Boeing said United Airlines' 777 fleet will be modified with a Performance Improvement Package that will result in greater fuel efficiency and reduced emissions. According to Boeing, The PIP involves a software change "to enable a drooped aileron, a ram air system improvement and the installation of improved wing vortex generators." The package, to be installed on 52 UA 777s, is expected to "reduce fuel spending per airplane by about $200,000 annually (assuming $100 per ...

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