A water salute occurs for ceremonial purposes when a vehicle travels under plumes of water expelled by two or more fire fighting vehicles. At an airport, typically an even number of vehicles will line up perpendicular on the sides of the taxiway or apron, and the plumes of water will form a series of arches. Symbolically the procession would look similar to a bridal party walking under a wedding arch or the Arch of Sabres at a military wedding. Water salutes are also used for ships and other watercraft, with water being delivered by fireboats.