Airbus is seeing better than expected fuel-burn savings during initial flight trials of its A320 winglet upgrade. The lift devices, which Airbus calls Sharklets, are supposed to replace wing-tip fences on A320s starting this year and on all NEO (new engine option) narrowbodies when they enter service starting in 2015. Flight testing of a modified A320 (MSN1) began in late 2011 with the first A320 equipped with the devices as a forward fit (MSN5098) completing its first flight in April. ...

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