The above ADSBXchange allows for conveniently exporting the data for both planes. Horiz. and vert. separation plotted vs. time. Since both planes are received by the same receivers we can assume that the time stamps are reasonably in sync. The rwy is 17/35 thus latitude can be directly used for horizontal separation.
The lines are the RWY thresholds. The leading craft is to the left in this plot (arriving at same lat earlier). FDX overtakes SWA in the first third, then SWA catches up and overtakes FDX in the last third of the RWY probably around rotation.
The alt profile of SWA indicates at least some situational awareness.
