Planes have special shaped wings that are curved at the top and flat at the bottom. So as the Engines push the plane and the wings forward through the air, the air rushes underneath and over top of the wing. The curved wing top creates a longer distance than the straight flat bottom, the air has further to travel to get to the same point at the back of the wing. This basically stretches the air out as it is still travelling at the same speed on top as it is below the wing. When the Air gets stretched out it becomes less dense and therefore lighter. Air that weighs less exerts lower pressure than the heavier underneath the wing, so now we have low pressure above the wing and high pressure below the wing. High pressure air always moves towards low pressure air, so the high pressure air underneath the wing is trying to move up towards the low pressure area above the wing. This is the point that causes lift because the high pressure air pushes up on the bottom of the wing trying to get to the low pressure.
So basically the plane moves forward creating different pressures on the top and bottom of the wing. The high pressure under the wing needs to move towards the low pressure above the wing. so pushes the wing upwards making the plane go up as its going forward.
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