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A double-deck 72.2m (237ft)-span swept wing passenger jet with two aft mounted Rolls-Royce Trent-like engines and an altitude ceiling of 55,000ft (16,700m) has been proposed as a more environmentally friendly airliner by a group of former UK aerospace engineers, calling their project Stratos.

Read more about Stratos... and if you want more images of future aviation concepts check out our gallery on AirSpace.

The B-17 affectionately known as Sally B has been grounded until 2009 due to engine trouble. The air show stalwart will not appear at any UK shows this year until its engines have been repaired.

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