diff --git a/src/airport_gui.cpp b/src/airport_gui.cpp
--- a/src/airport_gui.cpp
+++ b/src/airport_gui.cpp
@@ -144,9 +144,9 @@ static const NWidgetPart _nested_air_too
 		NWidget(WWT_STICKYBOX, COLOUR_DARK_GREEN, ATW_STICKYBOX),
 	EndContainer(),
 	NWidget(NWID_HORIZONTAL),
-		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, ATW_AIRPORT), SetFill(false, true), SetMinimalSize(42, 22), SetDataTip(SPR_IMG_AIRPORT, STR_TOOLBAR_AIRCRAFT_BUILD_AIRPORT_TOOLTIP),
-		NWidget(WWT_PANEL, COLOUR_DARK_GREEN, ATW_SPACER), SetMinimalSize(4, 22), SetFill(true, true), EndContainer(),
-		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, ATW_DEMOLISH), SetFill(false, true), SetMinimalSize(22, 22), SetDataTip(SPR_IMG_DYNAMITE, STR_TOOLTIP_DEMOLISH_BUILDINGS_ETC),
+		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, ATW_AIRPORT), SetFill(0, 1), SetMinimalSize(42, 22), SetDataTip(SPR_IMG_AIRPORT, STR_TOOLBAR_AIRCRAFT_BUILD_AIRPORT_TOOLTIP),
+		NWidget(WWT_PANEL, COLOUR_DARK_GREEN, ATW_SPACER), SetMinimalSize(4, 22), SetFill(1, 1), EndContainer(),
+		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, ATW_DEMOLISH), SetFill(0, 1), SetMinimalSize(22, 22), SetDataTip(SPR_IMG_DYNAMITE, STR_TOOLTIP_DEMOLISH_BUILDINGS_ETC),
 	EndContainer(),
 };
 
@@ -306,80 +306,80 @@ static const NWidgetPart _nested_build_a
 	EndContainer(),
 	/* Small airports. */
 	NWidget(WWT_PANEL, COLOUR_DARK_GREEN, BAW_SMALL_AIRPORTS_PANEL),
-		NWidget(WWT_LABEL, COLOUR_DARK_GREEN, BAW_SMALL_AIRPORTS_LABEL), SetMinimalSize(148, 14), SetFill(true, false), SetDataTip(STR_STATION_BUILD_AIRPORT_SMALL_AIRPORTS, STR_NULL),
+		NWidget(WWT_LABEL, COLOUR_DARK_GREEN, BAW_SMALL_AIRPORTS_LABEL), SetMinimalSize(148, 14), SetFill(1, 0), SetDataTip(STR_STATION_BUILD_AIRPORT_SMALL_AIRPORTS, STR_NULL),
 		NWidget(NWID_HORIZONTAL),
 			NWidget(NWID_SPACER), SetMinimalSize(2, 0),
 			NWidget(NWID_VERTICAL),
-				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_SMALL_AIRPORT), SetMinimalSize(144, 12), SetFill(true, false),
+				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_SMALL_AIRPORT), SetMinimalSize(144, 12), SetFill(1, 0),
 									SetDataTip(STR_STATION_BUILD_AIRPORT_SMALL_AIRPORT, STR_STATION_BUILD_AIRPORT_TOOLTIP),
-				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_COMMUTER_AIRPORT), SetMinimalSize(144, 12), SetFill(true, false),
+				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_COMMUTER_AIRPORT), SetMinimalSize(144, 12), SetFill(1, 0),
 									SetDataTip(STR_STATION_BUILD_AIRPORT_COMMUTER_AIRPORT, STR_STATION_BUILD_AIRPORT_TOOLTIP),
-				NWidget(NWID_SPACER), SetMinimalSize(0, 1), SetFill(true, false),
+				NWidget(NWID_SPACER), SetMinimalSize(0, 1), SetFill(1, 0),
 			EndContainer(),
 			NWidget(NWID_SPACER), SetMinimalSize(2, 0),
 		EndContainer(),
 	EndContainer(),
 	/* Large airports. */
 	NWidget(WWT_PANEL, COLOUR_DARK_GREEN, BAW_LARGE_AIRPORTS_PANEL),
-		NWidget(WWT_LABEL, COLOUR_DARK_GREEN, BAW_LARGE_AIRPORTS_LABEL), SetMinimalSize(148, 14), SetFill(true, false), SetDataTip(STR_STATION_BUILD_AIRPORT_LARGE_AIRPORTS, STR_NULL),
+		NWidget(WWT_LABEL, COLOUR_DARK_GREEN, BAW_LARGE_AIRPORTS_LABEL), SetMinimalSize(148, 14), SetFill(1, 0), SetDataTip(STR_STATION_BUILD_AIRPORT_LARGE_AIRPORTS, STR_NULL),
 		NWidget(NWID_HORIZONTAL),
 			NWidget(NWID_SPACER), SetMinimalSize(2, 0),
 			NWidget(NWID_VERTICAL),
-				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_CITY_AIRPORT), SetMinimalSize(144, 12), SetFill(true, false),
+				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_CITY_AIRPORT), SetMinimalSize(144, 12), SetFill(1, 0),
 									SetDataTip(STR_STATION_BUILD_AIRPORT_CITY_AIRPORT, STR_STATION_BUILD_AIRPORT_TOOLTIP),
-				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_METRO_AIRPORT), SetMinimalSize(144, 12), SetFill(true, false),
+				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_METRO_AIRPORT), SetMinimalSize(144, 12), SetFill(1, 0),
 									SetDataTip(STR_STATION_BUILD_AIRPORT_METRO_AIRPORT, STR_STATION_BUILD_AIRPORT_TOOLTIP),
-				NWidget(NWID_SPACER), SetMinimalSize(0, 1), SetFill(true, false),
+				NWidget(NWID_SPACER), SetMinimalSize(0, 1), SetFill(1, 0),
 			EndContainer(),
 			NWidget(NWID_SPACER), SetMinimalSize(2, 0),
 		EndContainer(),
 	EndContainer(),
 	/* Hub airports. */
 	NWidget(WWT_PANEL, COLOUR_DARK_GREEN, BAW_HUB_AIRPORTS_PANEL),
-		NWidget(WWT_LABEL, COLOUR_DARK_GREEN, BAW_HUB_AIRPORTS_LABEL), SetMinimalSize(148, 14), SetFill(true, false), SetDataTip(STR_STATION_BUILD_AIRPORT_HUB_AIRPORTS, STR_NULL),
+		NWidget(WWT_LABEL, COLOUR_DARK_GREEN, BAW_HUB_AIRPORTS_LABEL), SetMinimalSize(148, 14), SetFill(1, 0), SetDataTip(STR_STATION_BUILD_AIRPORT_HUB_AIRPORTS, STR_NULL),
 		NWidget(NWID_HORIZONTAL),
 			NWidget(NWID_SPACER), SetMinimalSize(2, 0),
 			NWidget(NWID_VERTICAL),
-				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_INTERNATIONAL_AIRPORT), SetMinimalSize(144, 12), SetFill(true, false),
+				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_INTERNATIONAL_AIRPORT), SetMinimalSize(144, 12), SetFill(1, 0),
 									SetDataTip(STR_STATION_BUILD_AIRPORT_INTERNATIONAL_AIRPORT, STR_STATION_BUILD_AIRPORT_TOOLTIP),
-				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_INTERCONTINENTAL_AIRPORT), SetMinimalSize(144, 12), SetFill(true, false),
+				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_INTERCONTINENTAL_AIRPORT), SetMinimalSize(144, 12), SetFill(1, 0),
 									SetDataTip(STR_STATION_BUILD_AIRPORT_INTERCONTINENTAL_AIRPORT, STR_STATION_BUILD_AIRPORT_TOOLTIP),
-				NWidget(NWID_SPACER), SetMinimalSize(0, 1), SetFill(true, false),
+				NWidget(NWID_SPACER), SetMinimalSize(0, 1), SetFill(1, 0),
 			EndContainer(),
 			NWidget(NWID_SPACER), SetMinimalSize(2, 0),
 		EndContainer(),
 	EndContainer(),
 	/* Heliports. */
 	NWidget(WWT_PANEL, COLOUR_DARK_GREEN, BAW_HELIPORTS_PANEL),
-		NWidget(WWT_LABEL, COLOUR_DARK_GREEN, BAW_HELIPORTS_LABEL), SetMinimalSize(148, 14), SetFill(true, false), SetDataTip(STR_STATION_BUILD_AIRPORT_HELIPORTS, STR_NULL),
+		NWidget(WWT_LABEL, COLOUR_DARK_GREEN, BAW_HELIPORTS_LABEL), SetMinimalSize(148, 14), SetFill(1, 0), SetDataTip(STR_STATION_BUILD_AIRPORT_HELIPORTS, STR_NULL),
 		NWidget(NWID_HORIZONTAL),
 			NWidget(NWID_SPACER), SetMinimalSize(2, 0),
 			NWidget(NWID_VERTICAL),
-				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_HELIPORT), SetMinimalSize(144, 12), SetFill(true, false),
+				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_HELIPORT), SetMinimalSize(144, 12), SetFill(1, 0),
 									SetDataTip(STR_STATION_BUILD_AIRPORT_HELIPORT, STR_STATION_BUILD_AIRPORT_TOOLTIP),
-				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_HELISTATION), SetMinimalSize(144, 12), SetFill(true, false),
+				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_HELISTATION), SetMinimalSize(144, 12), SetFill(1, 0),
 									SetDataTip(STR_STATION_BUILD_AIRPORT_HELISTATION, STR_STATION_BUILD_AIRPORT_TOOLTIP),
-				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_HELIDEPOT), SetMinimalSize(144, 12), SetFill(true, false),
+				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_HELIDEPOT), SetMinimalSize(144, 12), SetFill(1, 0),
 									SetDataTip(STR_STATION_BUILD_AIRPORT_HELIDEPOT, STR_STATION_BUILD_AIRPORT_TOOLTIP),
-				NWidget(NWID_SPACER), SetMinimalSize(0, 1), SetFill(true, false),
+				NWidget(NWID_SPACER), SetMinimalSize(0, 1), SetFill(1, 0),
 			EndContainer(),
 			NWidget(NWID_SPACER), SetMinimalSize(2, 0),
 		EndContainer(),
 	EndContainer(),
 	/* Bottom panel. */
 	NWidget(WWT_PANEL, COLOUR_DARK_GREEN, BAW_BOTTOMPANEL),
-		NWidget(WWT_LABEL, COLOUR_DARK_GREEN, BAW_COVERAGE_LABEL), SetMinimalSize(148, 14), SetFill(true, false), SetDataTip(STR_STATION_BUILD_COVERAGE_AREA_TITLE, STR_NULL),
+		NWidget(WWT_LABEL, COLOUR_DARK_GREEN, BAW_COVERAGE_LABEL), SetMinimalSize(148, 14), SetFill(1, 0), SetDataTip(STR_STATION_BUILD_COVERAGE_AREA_TITLE, STR_NULL),
 		NWidget(NWID_HORIZONTAL),
 			NWidget(NWID_SPACER), SetMinimalSize(14, 0),
 			NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
-				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_BTN_DONTHILIGHT), SetMinimalSize(60, 12), SetFill(true, false),
+				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_BTN_DONTHILIGHT), SetMinimalSize(60, 12), SetFill(1, 0),
 											SetDataTip(STR_STATION_BUILD_COVERAGE_OFF, STR_STATION_BUILD_COVERAGE_AREA_OFF_TOOLTIP),
-				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_BTN_DOHILIGHT), SetMinimalSize(60, 12), SetFill(true, false),
+				NWidget(WWT_TEXTBTN, COLOUR_GREY, BAW_BTN_DOHILIGHT), SetMinimalSize(60, 12), SetFill(1, 0),
 											SetDataTip(STR_STATION_BUILD_COVERAGE_ON, STR_STATION_BUILD_COVERAGE_AREA_ON_TOOLTIP),
 			EndContainer(),
 			NWidget(NWID_SPACER), SetMinimalSize(14, 0),
 		EndContainer(),
-		NWidget(NWID_SPACER), SetMinimalSize(0, 10), SetResize(0, 1), SetFill(true, false),
+		NWidget(NWID_SPACER), SetMinimalSize(0, 10), SetResize(0, 1), SetFill(1, 0),
 	EndContainer(),
 };