The highest navigational bridge on a ship; a small (often open) deck above the pilot house WordNet 3.0 & Open English WordNet

A fly system, or theatrical rigging system, is a system of ropes, pulleys, counterweights and related devices within a theater that enables a stage crew to fly quickly, quietly and safely components such as curtains, lights, scenery, stage effects and, sometimes, people. Wikipedia

A flying bridge is an open area on top of a surface ship that provides unobstructed views of the fore, aft, and the sides of a vessel, and that serves as an operating station for the ship's officers, such as the captain or officer of the watch. Wikipedia

Kind of nautical bridge Wikidata

A flying bridge. Wiktionary

A (usually open) area on top of, or at the side of, a ship's pilothouse, serving as an operating station for the officers in good weather or when manoeuvring in port. Wiktionary