do not double optimize the speed until IAF two times

aman/types/Inbound.py

@@ -31,10 +31,8 @@ class Inbound:
         flightTime, flightTimeUntilIaf, trackmiles = self.secondsUntilTouchdown(weatherModel)
 
         # calculate the maximum time to gain (assumption: 10% speed increase by acceleration and shortcuts)
-        avgSpeed = self.Report.distanceToIAF / (float(flightTimeUntilIaf.seconds) / 3600.0)
-        self.MaximumTimeToGain = flightTimeUntilIaf - timedelta(minutes = (self.Report.distanceToIAF / (avgSpeed * 1.1)) * 60)
         avgSpeed = trackmiles / (float(flightTime.seconds) / 3600.0)
-        self.MaximumTimeToGain += flightTime - timedelta(minutes = (trackmiles / (avgSpeed * 1.1)) * 60)
+        self.MaximumTimeToGain = flightTime - timedelta(minutes = (trackmiles / (avgSpeed * 1.1)) * 60)
 
         # calculate the different arrival times
         self.InitialArrivalTime = self.ReportTime + flightTime