How does an Airplane flies..?

We see may aeroplane flying over us in our daily life and most of us have thought how an object with tons of mass can easily fly over the sky.The mystery reveals here.
           An airplanes has got powerful engines which creates a thrust on backward direction and pushes the planes in forward direction.The basic concept of flying of airplane is due to the structure of their wings.It is made such that the air flowing over it moves faster creating a low pressure above the wings and the pressure below the wings is at high state which produces a lift.This concept is based on Bernoulli's Principle.It states that"Any fluid,including air possessing speed must lose pressure".This lose in pressure creates the pressure difference above the wings and below the wings.And as we know that air moves from high pressure area to low pressure area ,the air exerts the force on the bottom of the wings.This force is called 'lift' and it is the necessary thing of flight.
         The another thing to be noticed is as we have seen most of the heavy airplanes have their wings bended upward at the end.This is so because as we move towards the end of the wings,the direction of the air pressure inverts i.e. it acts downward which may be harmful for the airplanes.So to overcome this problem,engineers brings the concept of bending the wings at the end.An intresting fact about that is this concept is taken from the flying of the eagle.They conclude how the eagle bend its wings to get maximum lift which inspired us to design a big jets with short wings.