Can we design an aeroplane which is very light but sufficiently strong ??if yes then how??

Dear student, we can design light aeroplane( depending upon structure ). they can be made of Titanium or be made of composite materials like carbon fibre to reduce the structure weight. It makes the aeroplane lighter and stronge And no aeroplane is strong enough to survive a high speed crash, no matter from what material it is made of, unless it is made of Adamantium or Vibranium! Regards