Recap: Lift is generated by the wings and pushes the plain upwards! The opposite force is weight, which pulls the plane down.
Explanation
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The earth is huge, so it pulls all of us towards it by gravity.
A plane is PUSHED by lift and thrust and PULLED by weight and drag.
Lift(produced by the wings) is directed upwards while weight(gravity) is directed downwards.
Friction exists between molecules of all substances.
The airfoil shape of the wings generate lift.
Chemical potential energy is energy stored in the molecules of a substance. When it is burnt, the energy is released.
Chemical potential energy - fuel Gravitational potential energy - the plane's height
The engine of an airplane produces kinetic energy that pushes the plane forward.
All of the above would result in friction against the surface of the plane and slow it down.
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