It is a bit tedious to answer the question "this was where the traffic was sourced from, and this is where it was destined for" because of how NTA displays the data currently. You can click on any of the interfaces listed in the NetFlow Sources View on the NTA Summary page and you can see where traffic is flowing from that interfaces' perspective. There is no way I know of to get a quick "end to end" view of a flow. I do have a feature request for this ability on the Atlas map here: https://thwack.solarwinds.com/ideas/3621
HTH...