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What the different between subsonic and supersonic aircraft in term of material used?
Subsonic planes (like commercial airplaines) are designed to fly under the speed of sound, while supersonic planes (like fighter jets) fly faster than the speed of sound.
Subsonic planes are mostly made of aluminium, with steel and titanium alloys to reenforce and strengthen important parts. Supersonic planes, however, encounter problems like shock waves, or increased drag across their surface. To resolve these issues, some supersonic aircraft are made out of titanium (and/or alloys); but this can be expensive. The Concorde used aluminium alloys to increase its strength.