Future of Flight - Are the Doors Opening?

Concept images reveal how we'll glide across the sky in electric aeroplanes by 2050 

Perhaps, we will also abandon the obsolete and inefficient concept of reaction propulsion and replace it with the concept of field propulsion, the natural and universal means of producing kinetic energy differentials.

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HOW WILL AEROPLANES BE POWERED IN 2050? 

Engineers predict that aircraft will be electric by 2050.

Adding to the The Invisibility Factor

A side note into the properties of light: Several ways in which almost any matter can be made transparent

 
Most metals are opaque , but there are several ways in which almost any matter can be made transparent http://www.uotechnology.edu.iq/appsciences/filesPDF/material/lectures/2c/3-Materials_prperties8.pdf

Ordinary glass is just as dense as many metals and harder than most and yet transmits light quite readily. Most matter is opaque to light because the photons of light are captured and absorbed in the electron orbits of the atoms through which they pass. This capture will occur whenever the frequency of the photon matches one of the frequencies of the atom. The energy thus stored is then re-emitted, but usually in the infra-red portion of the spectrum, and so cannot be seen as light.

There are several ways in which almost any matter can be made transparent, or at least translucent. One method is to create a field matrix between the atoms which will tend to prevent the photon from being absorbed.  (Such a matrix develops in many substances during crystallization.) Another is to raise the frequency of the atoms above the highest absorption frequency of the atoms. (based upon current knowledge of light and matter, the reader should be able to extrapolate from here)