Unreserve helipads on heli death.

OpenRA.Mods.RA/Air/Aircraft.cs

@@ -75,8 +75,26 @@ namespace OpenRA.Mods.RA.Air
 		public virtual object Create( ActorInitializer init ) { return new Aircraft( init , this ); }
 	}
 
-	public class Aircraft : IMove, IFacing, IOccupySpace, ISync
+	public class Aircraft : IMove, IFacing, IOccupySpace, ISync, INotifyDamage
 	{
+		public IDisposable reservation;
+		
+		public void UnReserve()
+		{
+			if (reservation != null)
+			{
+				reservation.Dispose();
+				reservation = null;
+			}
+		}
+		
+		public void Damaged(Actor self, AttackInfo e)
+		{
+			if (e.DamageState == DamageState.Dead)
+				UnReserve();
+		}
+		
+		
 		protected readonly Actor self;
 		[Sync]
 		public int Facing { get; set; }

OpenRA.Mods.RA/Air/Helicopter.cs

@@ -30,7 +30,6 @@ namespace OpenRA.Mods.RA.Air
 
 	class Helicopter : Aircraft, ITick, IIssueOrder, IResolveOrder, IOrderVoice
 	{
-		public IDisposable reservation;
 		HelicopterInfo Info;
 
 		public Helicopter( ActorInitializer init, HelicopterInfo info) : base( init, info ) 

OpenRA.Mods.RA/Air/Plane.cs

@@ -27,7 +27,6 @@ namespace OpenRA.Mods.RA.Air
 
 	public class Plane : Aircraft, IIssueOrder, IResolveOrder, IOrderVoice, ITick, INotifyDamage, ISync
 	{
-		public IDisposable reservation;
 		[Sync]
 		public int2 RTBPathHash;
 		
@@ -78,21 +77,6 @@ namespace OpenRA.Mods.RA.Air
 			return (order.OrderString == "Move" || order.OrderString == "Enter") ? "Move" : null;
 		}
 
-		public void UnReserve()
-		{
-			if (reservation != null)
-			{
-				reservation.Dispose();
-				reservation = null;
-			}
-		}
-		
-		public void Damaged(Actor self, AttackInfo e)
-		{
-			if (e.DamageState == DamageState.Dead)
-				UnReserve();
-		}
-		
 		public void ResolveOrder(Actor self, Order order)
 		{
 			if (order.OrderString == "Move")