Refactor unreserve actions.

OpenRA.Mods.Common/Activities/Air/TakeOff.cs

@@ -36,8 +36,7 @@ namespace OpenRA.Mods.Common.Activities
 			if (self.World.Map.DistanceAboveTerrain(aircraft.CenterPosition).Length >= aircraft.Info.MinAirborneAltitude)
 				return;
 
-			// We are taking off, so remove reservation and influence in ground cells.
-			aircraft.UnReserve();
+			// We are taking off, so remove influence in ground cells.
 			aircraft.RemoveInfluence();
 
 			if (aircraft.Info.TakeoffSounds.Length > 0)

OpenRA.Mods.Common/Activities/Resupply.cs

@@ -191,6 +191,8 @@ namespace OpenRA.Mods.Common.Activities
 						QueueChild(move.MoveTo(rp.Location, repairableNear != null ? null : host.Actor));
 					else
 						QueueChild(new TakeOff(self));
+
+					aircraft.UnReserve();
 				}
 
 				// Aircraft without TakeOffOnResupply remain on the resupplier until something else needs it