Launch delays are sometimes part of the equation in determining when specific missions launch in relation to each other.  Sometimes, those delays occur to missions for the same agency, as is now the case with TDRS-M and CRS-12.  With replacement operations to the TDRS-M omni antenna underway, NASA/United Launch Alliance at first requested 10 August for TDRS-M – then changed that a day later to 20 August.  SpaceX has requested 14 August for the CRS-12 Dragon launch to the International Space Station.
