fleet leader

Noun

 * 1)  The airframe or component with the longest time in service, compared to others of the same design.
 * 2) * 2009 October 19, press release:
 * This Falcon 7X is now the fleet leader having flown over 800,000 nautical miles (148,148 km).
 * This Falcon 7X is now the fleet leader having flown over 800,000 nautical miles (148,148 km).