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Link here. It appears that the launch dates for both Falcon Heavy launches depend entirely on when the first Falcon 9 manned Dragon test flight takes place.
With Demo-1 having priority, the final preparations for Arabsat [using Falcon Heavy] will not be able to begin until the Demo-1 launch has occurred as there is only so much space in the Pad 39A hangar. With that in mind, Arabsat 6A will likely occur in the second half of March at the earliest, as NASA announced on Wednesday that Demo-1 is now targeting no earlier than March 2nd, 2019.
While the March 2nd launch date for Demo-1 is still tentative, it is understood that the Space Station’s Visiting Vehicle Schedule does have availability for a launch on that date should the NASA and SpaceX teams be ready.
Once Demo-1 and Arabsat are out of the way, Pad 39A will not be done supporting high profile missions. SpaceX will work to quickly turnaround the first stage boosters from the Arabsat 6A flight in order to reuse them for the STP-2 mission – the second Falcon Heavy launch of the year. STP-2 is a mission for the U.S. Air Force which will feature several technology demonstration payloads. According to FCC filings, the launch is currently scheduled for no earlier than April 30th, 2019. However, since this mission requires boosters from the Arabsat 6A launch, SpaceX will require several weeks between the two flights to refurbish the cores.
Therefore, STP-2 is directly connected to the launch schedule for Arabsat 6A which is in turn connected to Demo-1’s schedule. Consequently, the odds of a slip with STP-2’s date are high, as two major dominos currently stand in front of it.
In addition, the date for SpaceX’s launch abort test of Dragon depends entirely on the completion of the Demo-1 flight, since they plan to use that same capsule in the abort test.
Though there are a handful of other launches described in the article through April, but much of SpaceX’s schedule for the spring depends entirely on whether NASA can get off its duff and allow the Dragon test mission to fly. If NASA continues to drag its feet, everything else will get delayed. It would seem that at some point SpaceX might even have the right to demand financial compensation from NASA for the loss of income NASA is causing it. They don’t get paid for any of these launches until they fly, and thus NASA is preventing them from earning money from other customers.