+xEasy Cruising - 6/21/2017 1:26:19 PMIf I log-in to the SD website and go to 'Manage Subscritpion'-->'Manage Flightplans' I can see the FPL's I created in the SD app. I can close an fpl there. On a recent flight I asked the tower to close my flightplan (which I had filed through SD), which they did. I logged-in to the web-page some time later and the options were still Cancel/Close for that fpl. I closed it through the app just in case, and it showed the status closed.What does SD actually do to close an FPL? Does it matter if I close one that's already been closed by someone else? Also, why doesn't it know that the fpl is already closed? I cannot see how SD then knows that the fpl is really closed when it closes it itself.The final question is that if I close an FPL using the SD web page, and it shows status 'Closed' , am I 100% sure it is really closed?Does anyone out there use the fpl close function exclusively ? Does it always work ? Input appreciated.