Examples are: aluminium, iron, titanium, carbon.
nickel
Aluminium is very common in aircraft.
Some of the physical activities that the aircraft mechanics do is the erecting of ladders, repair and maintenance of the aircraft.
Some aircraft that have two floors have stairs. Most aircraft do not.
Some flew some by ship as cargo or on aircraft carriers
yes, Aerospace & Mechanical Engineering share many common elements.
It depends on which aircraft you mean: some are single seaters, some are two seaters.
Aircraft and possibly some tools to repair them.
airbus a380 and some government aircraft
They are called Supersonic aircraft. Some aircraft can only do that. Some planes have reached even Hypersonic speeds.
In order to get aircraft financing, one needs to have an aircraft and some form of aviation insurance. There are a number of insurance companies that offer this insurance.
Retractable wheels on aircraft are often called "landing gear", and some of the engine designs used in aircraft can contain a gear box. But gears as they look like in cars aren't used in aircraft.