[skykooler]

> An airplane with a fail-safe fuselage that can disconnect from the rest of the plane, parachute to the ground and land (or float) safely.

The thing is, the vast majority of airplane crashes happen at takeoff or landing, because that's when there's the least time to react if something goes wrong. Unfortunately, this is also when a parachute would be least effective, because there isn't sufficient altitude to deploy one. (Never mind that we don't even have a design for parachutes large enough to safely land an airliner fuselage.) Additionally, by giving the fuselage the ability to separate from the wings, you seriously weaken the strongest and most critical point of the aircraft: the main wing spar. In other words, you gain an additional risky emergency landing method, which could only be deployed in certain very unlikely circumstances (if the plane is high enough to safely deploy parachutes, it it probably high enough to glide to a safe landing, or at least safer then landing wherever you end up with parachutes) - and in the process you also now have a much higher chance of the wings falling off in midair.

I think I prefer a normal airliner design.