^ 4.04.14.24.3Foust, Jeff. Musk reiterates plans for testing BFR. SpaceNews. 2018-03-12 [2018-03-15]. Construction of the first prototype spaceship is in progress. 'We’re actually building that ship right now,' he said. 'I think we’ll probably be able to do short flights, short sort of up-and-down flights, probably sometime in the first half of next year.'
^Jeff Foust. Musk offers more technical details on BFR system. SpaceNews. 15 October 2017 [15 October 2017]. [Musk] added that, since the presentation last month, SpaceX has revised the design of the BFR spaceship to add a "medium area ratio" Raptor engine to its original complement of two engines with sea-level nozzles and four with vacuum nozzles. That additional engine helps enable that engine-out capability ... and will "allow landings with higher payload mass for the Earth to Earth transport function."
^ 8.08.1William Harwood. Elon Musk revises Mars plan, hopes for boots on ground in 2024. SpaceflightNow. 29 September 2017 [30 September 2017]. The new rocket is still known as the BFR, a euphemism for 'Big (fill-in-the-blank) Rocket.' The reusable BFR will use 31 Raptor engines burning densified, or super-cooled, liquid methane and liquid oxygen to lift 150 tons, or 300,000 pounds, to low Earth orbit, roughly equivalent to NASA’s Saturn 5 moon rocket.
^ 20.020.1Chris Gebhardt. The Moon, Mars, & around the Earth – Musk updates BFR architecture, plans. NASASpaceflight.com. 29 September 2017 [2 October 2017]. In a move that would have seemed crazy a few years ago, Mr. Musk stated that the goal of BFR is to make the Falcon 9 and the Falcon Heavy rockets and their crew/uncrewed Dragon spacecrafts redundant, thereby allowing the company to shift all resources and funding allocations from those vehicles to BFR. Making the Falcon 9, Falcon Heavy, and Dragon redundant would also allow BFR to perform the same Low Earth Orbit (LEO) and Beyond LEO satellite deployment missions as Falcon 9 and Falcon Heavy – just on a more economical scale as multiple satellites would be able to launch at the same time and on the same rocket thanks to BFR’s immense size.
^Jeff Foust. Musk offers more technical details on BFR system. SpaceNews. 15 October 2017 [15 October 2017]. [The] spaceship portion of the BFR, which would transport people on point-to-point suborbital flights or on missions to the moon or Mars, will be tested on Earth first in a series of short hops. ... a full-scale Ship doing short hops of a few hundred kilometers altitude and lateral distance ... fairly easy on the vehicle, as no heat shield is needed, we can have a large amount of reserve propellant and don’t need the high area ratio, deep space Raptor engines.