Index: src/ai/api/ai_airport.hpp
===================================================================
--- src/ai/api/ai_airport.hpp	(revision 12187)
+++ src/ai/api/ai_airport.hpp	(working copy)
@@ -83,7 +83,7 @@
 	 * @pre tile is always positive and smaller than AIMap::GetMapSize().
 	 * @return whether the airport has been/can be build or not.
 	 */
-	bool BuildAirport(TileIndex tile, AirportType type);
+	static bool BuildAirport(TileIndex tile, AirportType type);
 
 	/**
 	 * Removes a airport.
@@ -91,7 +91,7 @@
 	 * @pre tile is always positive and smaller than AIMap::GetMapSize().
 	 * @return whether the airport has been/can be removed or not.
 	 */
-	bool RemoveAirport(TileIndex tile);
+	static bool RemoveAirport(TileIndex tile);
 
 	/**
 	 * Get the first hanger tile of the airport.
@@ -99,7 +99,7 @@
 	 * @pre tile is always positive and smaller than AIMap::GetMapSize().
 	 * @return the first hanger tile of the airport.
 	 */
-	TileIndex GetHangarOfAirport(TileIndex tile);
+	static TileIndex GetHangarOfAirport(TileIndex tile);
 };
 
 #endif /* AI_AIRPORT_HPP */
Index: src/ai/api/ai_airport.cpp
===================================================================
--- src/ai/api/ai_airport.cpp	(revision 12187)
+++ src/ai/api/ai_airport.cpp	(working copy)
@@ -47,16 +47,16 @@
 	return _patches.modified_catchment ? GetAirport(type)->catchment : 4;
 }
 
-bool AIAirport::BuildAirport(TileIndex tile, AirportType type)
+/* static */ bool AIAirport::BuildAirport(TileIndex tile, AirportType type)
 {
 	/* Outside of the map */
 	if (tile >= ::MapSize()) return false;
 	if (type > AT_HELISTATION) return 0;
 
-	return this->DoCommand(tile, type, 0, CMD_BUILD_AIRPORT);
+	return DoCommand(tile, type, 0, CMD_BUILD_AIRPORT);
 }
 
-bool AIAirport::RemoveAirport(TileIndex tile)
+/* static */ bool AIAirport::RemoveAirport(TileIndex tile)
 {
 	/* Outside of the map */
 	if (tile >= ::MapSize()) return false;
@@ -64,10 +64,10 @@
 	/* Not a airport tile */
 	if (!IsAirportTile(tile) && !IsHangarTile(tile)) return false;
 
-	return this->DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);
+	return DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);
 }
 
-TileIndex AIAirport::GetHangarOfAirport(TileIndex tile)
+/* static */ TileIndex AIAirport::GetHangarOfAirport(TileIndex tile)
 {
 	if (!IsTileType(tile, MP_STATION)) return INVALID_TILE;
 
Index: src/ai/api/ai_airport.hpp.sq
===================================================================
--- src/ai/api/ai_airport.hpp.sq	(revision 12187)
+++ src/ai/api/ai_airport.hpp.sq	(working copy)
@@ -35,10 +35,9 @@
 	SQAIAirport.DefSQStaticMethod(engine, &AIAirport::GetAirportWidth,          "GetAirportWidth",          2, "xi");
 	SQAIAirport.DefSQStaticMethod(engine, &AIAirport::GetAirportHeight,         "GetAirportHeight",         2, "xi");
 	SQAIAirport.DefSQStaticMethod(engine, &AIAirport::GetAirportCoverageRadius, "GetAirportCoverageRadius", 2, "xi");
+	SQAIAirport.DefSQStaticMethod(engine, &AIAirport::BuildAirport,             "BuildAirport",             3, "xii");
+	SQAIAirport.DefSQStaticMethod(engine, &AIAirport::RemoveAirport,            "RemoveAirport",            2, "xi");
+	SQAIAirport.DefSQStaticMethod(engine, &AIAirport::GetHangarOfAirport,       "GetHangarOfAirport",       2, "xi");
 
-	SQAIAirport.DefSQMethod(engine, &AIAirport::BuildAirport,       "BuildAirport",       3, "xii");
-	SQAIAirport.DefSQMethod(engine, &AIAirport::RemoveAirport,      "RemoveAirport",      2, "xi");
-	SQAIAirport.DefSQMethod(engine, &AIAirport::GetHangarOfAirport, "GetHangarOfAirport", 2, "xi");
-
 	SQAIAirport.PostRegister(engine);
 }