They use every metal in aircraft, but most of the metal in an aircraft is aluminum.
aluminum
Aluminium is a popular lightweight metal used in the manufacture of aircraft.
The most common metal in aircraft is aluminium. However there is also steel , copper and sometimes gold in varying amounts.
the metal used in building most planes is alumiun as this type of metal as it can expand as the pressure in side the aircraft is greater than the pressure outside the aircraft. it is also the lightest suitable metal although boeing's 787 has been constucted with acompisite material.
Almost always it is aluminum.
Titanium(Ti)
aluminium
Mostly aluminium alloys, but some aircraft have used steel, titanium and more recently, composite materials.
Aluminum is a common metal for aircraft to be constructed from.
Materials used for aircraft components include metal alloys. They must be extremely heat resistant and have exceptional strength and performance.
If you meant titanium, it is a very strong lightweight metal that is used in aircraft and rockets.