Flightglobal:

Engine Alliance is confident it can maintain or extend the 1% fuel burn advantage it claims for its GP7200 on the Airbus A380 over the rival Rolls-Royce Trent 900 through systematic upgrades over the coming years....

Author: Max Kingsley-Jones

Date: 19 June 2009

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Who is fooling who here.  We have Boeing, on the one hand, claiming that the VLA market has potential for only 450 units, most of them freight aicraft, yet we have two of the biggest engine makers falling over themselves trying to position their offering as the most competitive choice for the A380. I am no expert in this field, but I can read between the lines.