Hello there. I was able to delete a corridor scan from my Site Scan project.
I first deleted the flight plan on the ArcGIS Flight app by going to "Flight Plans" and swiping to the left the flight plan I wanted to delete. Then, I synced the ArcGIS Flight project with the cloud by tapping the blue cloud icon at the top of the screen next to the project name and then selecting "Sync with Cloud". Once the spinning wheel stopped, I refreshed my browser with Site Scan Manager and the flight plan was removed.
Let me know if this does not work for you!
