a Practical Movement
Not every touch is symbolic.
When people board an aircraft, they may walk up stairs, cross a jet bridge, move through a narrow doorway, or navigate a busy boarding area.
Someone might briefly touch a nearby surface for balance, avoid bumping into another person, or steady themselves while changing direction.
From a distance, that ordinary movement can look deliberate.
The setting can also affect what you see. Boarding stairs and aircraft access equipment differ between airports, and passengers may move close to the aircraft while following staff
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