Pictogramme of hierarchy - people on a ladder. A hierarchy (from the Greek hierarchia, rule of a high priest, from hierarkhes, leader of sacred rites) is an arrangement of items (objects, names, values, categories, etc.) in which the items are represented as being above, below, or at the same level as one another.
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Four rental car companies at the airport â Avis, Budget, Hertz and National â offer vehicles for people with disabilities. Reservations for equipped vehicles must be made at least 48 to 72 hours in advance. Off-airport rental car companies listed on this page will pick up their customers from the rental car terminal.