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239 - ATPL - The span-wise flow is caused by the difference between the air pressure on top and beneath the wing and its direction of movement goes from:

Question 239 - Principles of Flight - ATPL - Airline Transport Pilot license

Beneath to the top of the wing via the wing tip
The top to beneath the wing via the leading edge
Beneath to the top of the wing via the trailing edge
The top to beneath the wing via the wing's trailing edge

Training tests and timed exam simulations ATPL - Airline Transport Pilot license