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Some of the techniques I use in Great Circle Routes for 50 Busiest Airports might be of use here. It includes a distance formula as well as labeling the endpoints. In that example, the distance is in an annotation rather than the endpoints, but adding it to the endpoint label can be done by simply dropping the distance on the label shelf.
I ended up adding some extra columns to my source that were duplicative, but made the formula work. Although this worked for my immediate need, I definitely want to try circle routes with this data now. That is very interesting! Thanks again!
Always happy to help!