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The Airbus A380 isn't too big for today's airports, but the two instances of wingtip impact have been caused by flight crew neglegence. The Antonov An-225 has longer wings, anf functions well at a lot of airports. The A380 crew for Air France was taxxing way too fast, and weren't paying attention to their wingtip cameras. The Airbus Demonstration Crew were just showing off, and hurt their own company's plane, they're just full of themselves. My Dad hears Emirates and Air France pilots called their flight number with SUPER in it over the ocean, where it doesn't matter. Anyways, the A380 us big and ugly, and the 747-8 is much better.
As for the Boeing 797; the Boeing 797 will be an all-new thing, with more composites, but I beleive it will be more like the Bombardier CSeries, with an aluminum fuselage, as the full composites aren't as beneficial in a narrow-body configuration as in widebody layout. It will most likely be a narrow-body, however the chance of an all-new midbody layout with 2-2-2 arrangment is there, but we'll see. It will feature a 777/787 style fly-by-wire system; it will most likely by higher off the ground, like the A320 or 757, as to avoid the squished nacelles. It will most likely have the option ot optimise the gains when using biofuels. It will almost definitely have a new nose section, apart from the classic Boeing 707,727,737 look. It will feature a higher pressurization ratio (most likely) to have better comfort and higher humidity abilities, whether or not it is a full composite fuselage. It probably won't have the wing dihedral and flex of the 747-8 and 787, most likely with raked wingtips or winglets (raked winglets?). There will be a longer range model, with ETOPS 210min (why have 330 like the 787? Isn't the point not being too far from land in the twin?). It will have a 99% of being a twin, unless the Boeing 727-500MT (modern technology) comes out [just kidding]. It will have a better flight quality, as result of the fly-by-wire system, and will be able to handle turbulence much better than the A320 series. The 797 will be built at the current factory in Renton, and probably they'll open up the old narrowbody factory at Boeing Field/King County to help get the planes out quickly. If Boeing is smart, they won't outsource so many things outside of the US, but will, like the 787, have many pre-fabricated parts as so they could complete an aircraft in 3-7 days, for production reasons.
The A320neo is an over-hyped plane, based on the old A320 design, which is a rough-riding plane, and, along with the 737NG, is in need of a next generation replacement or update. Although it promises effiency and pilot/fleet integration, and will save the airlines some money, but now that Boeing is running 747-8F's and 737NGs on biofuels, as well as GE, with KLM running commercial flights (overland) with biofules on occaison, their (biofuel's) promise is better than that of higher efficiency for JET-A fuels. Now than Boeing is making their fuels with plants that aren't food (unlike ethanol) the promises are great.
Thats my two-cents. My 797 info are just my personal predictions.
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