Sorry, I was confused since you mentioned between two airports - the telemetry is showing the direct distance between you and the destination airport. It does not show you the remaining enroute distance, and this is intentional - it is related to the “Bearing to destination” option in that it disregards the route completely. Related post:
That said, we would like to add an additional metric that covers this in a future iteration! So thank you for creating this thread, much appreciated.
Kind Regards,
Malte