Go by quickly, as time

• Go by rapidly, as time
• Ceremonial flight
• A low-altitude flight (usually of military aircraft) over spectators on the ground
• Aerial salute
• Bridge formed by the upper level of a crossing of two highways at different levels

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
flypast \fly"past\ (fl[imac]"p[a^]st), n. the upper level of a crossing of two highways at different levels; same as flyover ; called in the United States an overpass . [Brit.] Syn: overpass, flyover. a low-altitude flight (usually of military aircraft) ...

Wiktionary Word definitions in Wiktionary
n. (context British English) A low-level flight of a ceremonial nature; a flyover (qualifier: US)

Wikipedia Word definitions in Wikipedia
A flypast is a ceremonial or honorific flight by a group of aircraft or a single aircraft. The term flypast is used in the United Kingdom and the Commonwealth . In the United States , the terms flyover and flyby are used. Flypasts are often tied in with ...

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ But the flypast had to be called off because of the low cloud and rain. ▪ The RAf marked the ceremony with a Nimrod flypast , finally ensuring that their colleagues are not forgotten.