The IXION windowless jet -- which makes its interior transparent using display panels that cover most of the cabin -- might look like an impossible sci-fi concept but the fact is that it could be done today using existing display technologies. Check out the video. This thing is so cool.
The concept -- created by Technicon Design -- uses external cameras to capture a 360-degree panoramic view of the exterior, which then is adjusted for perspective and displayed on the cabin's walls to give the illusion of transparent walls. The walls can display any other content too.
Perhaps flying inside a giant semi-cylindrical display would get tiring at one point, but I would like to see it built and try it.