The two strap-on liquid-fuel boosters and the center core are re-usable, though the center-core is typically expended on most mission profiles due to its speed at main engine cut-off. First launched in 2018, there have been a limited number of launches since then, largely due to the significant improvements in the Falcon 9 overall - allowing it to handle flight profiles that originally only Falcon Heavy would have been able to reach.
Falcon Heavy has made 10 flights, successful, with flight 11 planned for October 2024.
Time from initial announcement to first flight was nearly 7 years, from April 2011 to February 2018. Often described as delayed, the original specifications of the original Falcon Heavy design were surpassed by the continued development of the Falcon 9 vehicle on which it was based. As a result, the pressure to develop the vehicle for manifested customer payloads did not put pressure on development until Falcon 9 reached its maximum performance with the Block 5 configuration.
Using the same first-stages, second-stage, engines, and fairing as the Falcon 9, development focused on the stresses of strapping three first-stage booster cores together. Attempts to include a fuel cross-feeding system were abandoned as too complicated.
Full-expended Falcon Heavy stack to send Europa Clipper off on the first leg of its journey to Europa.
