--- a/src/aircraft.h	Sun Apr 29 21:24:08 2007 +0000
+++ b/src/aircraft.h	Sun Apr 29 22:33:51 2007 +0000
@@ -131,6 +131,7 @@
 	virtual ~Aircraft() {}
 
 	const char *GetTypeString() { return "aircraft"; }
+	void MarkDirty();
 };
 
 #endif /* AIRCRAFT_H */