It seems shortsighted to think that a simple study on vacation planning habits explains identity document verification. My intuition tells me that the psychological motors behind planning excursions and ensuring legal travel are not the same. The fear of missing a flight or being stuck at the border, like tourists facing non-compliant papers at Barcelona airport, is a much more direct and strong motivation. This correlation model is unproven; to validate it, questions specifically targeting the fear of consequences or past experiences of denial of boarding would be needed.