boarding

kyytiin nouseminen, nousu

lautarakennelma, laudoitus (present participle of)
the act of people getting aboard a ship or aircraft; embarkation
2000, Peter Gregory Furth, Data Analysis for Bus Planning and Monitoring (page 24)

Load profiles are a standard analysis tool showing passenger activity (boardings, alightings) and passenger load at each stop along a route in a single direction.