Magenta line in map

[magicnorm]

I am a new Pilot2ATC user (10 day trial). I have a beginner question.

When I created a Flight Plan between two airports, Pilot2ATC draws a white line between them, but it also draws a magenta line from the last airport to “nowhere”.

What is this magenta line?

 

[jameslkey]

It appears to be P2As initial decision on you arrival runway. 

[Dave-Pilot2ATC]

It is the extended centerline of the active runway.  James is correct.