diff -r b25cf31294e9 -r 5a8b295aa345 src/rail_gui.cpp
--- a/src/rail_gui.cpp	Tue Mar 27 21:58:38 2007 +0000
+++ b/src/rail_gui.cpp	Tue Mar 27 23:27:27 2007 +0000
@@ -699,6 +699,8 @@
 
 		if (WP(w,def_d).close) return;
 
+		_thd.airport_template = false;  // ensure irregular airport support disabled
+
 		if (_railstation.dragdrop) {
 			SetTileSelectSize(1, 1);
 		} else {