$$ The use of aluminium alloys in large passenger jets will diminish progressively over the next decade from

around $80\%$ ?of the airframe mass to $11\%,$ ?unless major improvements in aluminium alloys take place. $-$

Boeing Civil Aircraft Company representative in $1983.$ ?The Boeing representative was incorrect. Explain

why their prediction did not come to pass in the timescale suggested, and give your arguments and reasoning

behind what has actually happened and is happening now.

It is $20$ ?marks, needs to be very detailed