(svn r16505) -Fix [FS#2951] (r16472): since g++ 4.4 the implicit (default) constructor will zero the whole class. This caused all vehicle indices to be 0, which causes all kinds of trouble.

src/aircraft.h

@@ -100,6 +100,8 @@ struct Aircraft : public SpecializedVehicle<Aircraft, VEH_AIRCRAFT> {
 	StationID targetairport;
 	byte state;
 
+	/** We don't want GCC to zero our struct! It already is zeroed and has an index! */
+	Aircraft() : SpecializedVehicle<Aircraft, VEH_AIRCRAFT>() {}
 	/** We want to 'destruct' the right class. */
 	virtual ~Aircraft() { this->PreDestructor(); }