At the 2nd time of asking, a fully-expendable Falcon 9 rocket, carrying the 5 1/2 tonne EchoStar XXIII satellite the heaviest geosynchronous payload yet launched by the Falcon 9, was launched into Geostationary Transfer Orbit (GTO).
The launch occurred at 5:35 am UTC on Thursday (17th March 2017).
Here are some pictures of the launch
The initial attempt was postponed on Tuesday due to high winds at high altitude above launch site 39A, at the Kennedy Space Center.
Due to the weight of the satellite, and its proposed orbit, the Falcon 9 1st stage was NOT returned to the launch site to be reused.