diff --git a/src/script/api/script_airport.cpp b/src/script/api/script_airport.cpp
--- a/src/script/api/script_airport.cpp
+++ b/src/script/api/script_airport.cpp
@@ -49,21 +49,21 @@
 	return ::IsTileType(tile, MP_STATION) && ::IsAirport(tile);
 }
 
-/* static */ int32 ScriptAirport::GetAirportWidth(AirportType type)
+/* static */ SQInteger ScriptAirport::GetAirportWidth(AirportType type)
 {
 	if (!IsAirportInformationAvailable(type)) return -1;
 
 	return ::AirportSpec::Get(type)->size_x;
 }
 
-/* static */ int32 ScriptAirport::GetAirportHeight(AirportType type)
+/* static */ SQInteger ScriptAirport::GetAirportHeight(AirportType type)
 {
 	if (!IsAirportInformationAvailable(type)) return -1;
 
 	return ::AirportSpec::Get(type)->size_y;
 }
 
-/* static */ int32 ScriptAirport::GetAirportCoverageRadius(AirportType type)
+/* static */ SQInteger ScriptAirport::GetAirportCoverageRadius(AirportType type)
 {
 	if (!IsAirportInformationAvailable(type)) return -1;
 
@@ -89,7 +89,7 @@
 	return ScriptObject::Command<CMD_LANDSCAPE_CLEAR>::Do(tile);
 }
 
-/* static */ int32 ScriptAirport::GetNumHangars(TileIndex tile)
+/* static */ SQInteger ScriptAirport::GetNumHangars(TileIndex tile)
 {
 	if (!::IsValidTile(tile)) return -1;
 	if (!::IsTileType(tile, MP_STATION)) return -1;
@@ -126,7 +126,7 @@
 }
 
 
-/* static */ int ScriptAirport::GetNoiseLevelIncrease(TileIndex tile, AirportType type)
+/* static */ SQInteger ScriptAirport::GetNoiseLevelIncrease(TileIndex tile, AirportType type)
 {
 	if (!::IsValidTile(tile)) return -1;
 	if (!IsAirportInformationAvailable(type)) return -1;
@@ -156,7 +156,7 @@
 	return AirportGetNearestTown(as, AirportTileTableIterator(as->table[0], tile), dist)->index;
 }
 
-/* static */ uint16 ScriptAirport::GetMaintenanceCostFactor(AirportType type)
+/* static */ SQInteger ScriptAirport::GetMaintenanceCostFactor(AirportType type)
 {
 	if (!IsAirportInformationAvailable(type)) return 0;
 
diff --git a/src/script/api/script_airport.hpp b/src/script/api/script_airport.hpp
--- a/src/script/api/script_airport.hpp
+++ b/src/script/api/script_airport.hpp
@@ -96,7 +96,7 @@ public:
 	 * @pre IsAirportInformationAvailable(type).
 	 * @return The width in tiles.
 	 */
-	static int32 GetAirportWidth(AirportType type);
+	static SQInteger GetAirportWidth(AirportType type);
 
 	/**
 	 * Get the height of this type of airport.
@@ -104,7 +104,7 @@ public:
 	 * @pre IsAirportInformationAvailable(type).
 	 * @return The height in tiles.
 	 */
-	static int32 GetAirportHeight(AirportType type);
+	static SQInteger GetAirportHeight(AirportType type);
 
 	/**
 	 * Get the coverage radius of this type of airport.
@@ -112,7 +112,7 @@ public:
 	 * @pre IsAirportInformationAvailable(type).
 	 * @return The radius in tiles.
 	 */
-	static int32 GetAirportCoverageRadius(AirportType type);
+	static SQInteger GetAirportCoverageRadius(AirportType type);
 
 	/**
 	 * Get the number of hangars of the airport.
@@ -120,7 +120,7 @@ public:
 	 * @pre ScriptMap::IsValidTile(tile).
 	 * @return The number of hangars of the airport.
 	 */
-	static int32 GetNumHangars(TileIndex tile);
+	static SQInteger GetNumHangars(TileIndex tile);
 
 	/**
 	 * Get the first hangar tile of the airport.
@@ -180,7 +180,7 @@ public:
 	 * @return The amount of noise added to the nearest town.
 	 * @note The noise will be added to the town with TownID GetNearestTown(tile, type).
 	 */
-	static int GetNoiseLevelIncrease(TileIndex tile, AirportType type);
+	static SQInteger GetNoiseLevelIncrease(TileIndex tile, AirportType type);
 
 	/**
 	 * Get the TownID of the town whose local authority will influence
@@ -198,7 +198,7 @@ public:
 	 * @pre IsAirportInformationAvailable(type)
 	 * @return Maintenance cost factor of the airport type.
 	 */
-	static uint16 GetMaintenanceCostFactor(AirportType type);
+	static SQInteger GetMaintenanceCostFactor(AirportType type);
 
 	/**
 	 * Get the monthly maintenance cost of an airport type.