The only thing i could come up with was because the airflow travels a further distances and tries to meet up with the air below the wing. He told me this was correct but again asked why does this happen. ?
This is not correct...but is the popular explanation in pilot circles...and is actually distributed in FAA publications.
The best, most concise and correct answer is that lift is produced by a pressure differential between the top and bottom of the wing.
This pressure differential is caused by two laws of physics in action...1) the Continuity Principle and 2) Daniel Bernoulli's Principle.
The Continuity Principle states that mass cannot be created or destroyed and is represented by A1V1=A2V2 (area and velocity). As camber or an angle of attacked is introduced...the top side of the airfoil reduces the Area (A2) for the mass airflow to go. Therefore, the velocity must increase to fit the mass airflow into the reduced area. (i.e. the "free stream flow" area has been restricted by the airfoil.)
Now, Bernoulli gets involved. Bernoulli states that as velocity increases, pressure decreases. The pressure on top of the wing is reduced more than the pressure on the bottom and the lift force is created.
The airflow over the top and the airflow over the bottom have nothing to do with each other and "like" particles do not "meet" at the trailing edge.
Now...you know the simple truth.
Continuity Principle + Bernoulli = Lift.