Seeing, Tasting, Touching, Smelling, Hearing, and the mind. These sensations bring information into the brain process that information and decide what to do with it.
The airport is like a dust storm flooding the senses. Through the breath these particles become a slow motion picture enabling us to sift through decide and discern the act or action if any needed in the moment. Observing becomes the most useful tool overlooked without focusing on the breath.