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Boeing unlikely to resume passenger 767 production
Boeing is unlikely to resume production of the passenger version of the 767-300ER, even as airlines look to meet fleet needs until the possible New Mid-market Aircraft (NMA) comes on the market in the next decade. (www.flightglobal.com) さらに...
I imagine 767's and 757's with modern engines. Pipe dream, I know. I cannot believe the 737-900 travesty could hold a candle to a re-engined '57 and a re-engined '67 likely would give the 787 a run for it's money, especially considering the price differential between new and used.
Similar to A350 vs A330neo.
Can't be done, to maintain a decent econ cruise altitude all four engines are require.
Same thing with the A-380. Don't throw them away. Flying slower with more efficient engines or going to two larger engines (ETOPS) can give bargain rates overseas. It still beats the Hindenberg, rowing or swimming. Here's an idea: turn off the outer two (1 and 4) when up to altitude and cruise with two (or have the outer run slower with lower fuel consumption).
Regarding your ideas, changing the configuration to two engines would require a new type rating... and all engines are required at altitude. Even shutting one down necessities descent to a lower and less efficient altitude. It worked for the P3 because they were already just above the sea.
But, the older (10+) year planes are uncomfortable compared the newer technologies (noise and airpressure). I just flew over Pacific in a 777 compared to 787 last month. Loud and headache producing in 777 Used to love that plane, but last I stepped out of a 787/A380 ended that affair. You may not love the form factors, but the physical experience is light years better on the new planes.
Don't bring back 30 year old tech because in a few years it will feel like flying on 747 does now. (Conjur up working a jack-hammer all day.)