don't forget that each airline will choose it's own seat config and layout ,
I flew on Austrian Airlines A321 a few years ago on a flight from Vienna to London , one of the best flights on a int Europe route of 2-3 hours I ever had,
It depends on the airline , though I think if airlines want to use these on longer flights ie , Sydney > Bali , or to Japan from AUS as Jetstar is wanting to do , then they will need to focus on passenger comfort
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