Why is Falcon Heavy different from other SpaceX rockets? Why did the second Falcon Heavy flight take so long? Even though the first Falcon Heavy flight appeared to be nearly flawless, SpaceX probably made adjustments. It launched 20 Falcon 9 missions in 2018, more than in any previous year, in addition to the one Falcon Heavy launch. When Mr. Musk first announced the rocket in 2011, he said he expected that there would be a 50/50 mix between the Falcon 9 and the Falcon Heavy.

Source: International New York Times April 11, 2019 21:15 UTC