It depends on the airline and the size of the plane.
about 400
Egyptian planes can only carry 10kg but others in Europe can carry 100's
No single person invented the aeroplane. Over a number of years many people invented different parts to contribute to its development.
I have always done so.
Air pressure
Sufficient for your needs
This aeroplane has crossed the Atlantic Ocean many times.
Phone (but it has too be on aeroplane mode), sweets, not drinks, many more
If you mean how many people it can carry then it can carry three people.
The aeroplane without a pilot is called a drone. Drones are useful in many situations.
wright brothers
By ship and aeroplane.