(svn r12293) -Feature: Ability to change aircraft speed factor, from so

called 'realistic' (matching other vehicles) (1/1) to original TTD 
speed (1/4). Note this option defaults to original TTD speed.

src/settings_gui.cpp

@@ -818,6 +818,7 @@ static const char *_patches_vehicles[] = {
 	"wagon_speed_limits",
 	"disable_elrails",
 	"freight_trains",
+	"plane_speed",
 	"timetabling",
 };