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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Inflight purchases. United accepts VisaÂ®, and all other major credit cards, including MasterCardÂ®, American ExpressÂ®, DiscoverÂ®, Diners ClubÂ® and JCB, for inflight purchases on all United and United ExpressÂ® flights. Debit cards bearing Visa or MasterCard logos are accepted on board as well.