Added maintenance glass airlock and external glass airlock.

code/game/machinery/doors/airlock_types.dm

@@ -108,6 +108,12 @@
 	doortype = /obj/structure/door_assembly/door_assembly_viro/glass
 	glass = 1
 
+/obj/machinery/door/airlock/glass_maintenance
+	icon = 'icons/obj/doors/airlocks/station/maintenance.dmi'
+	opacity = 0
+	doortype = /obj/structure/door_assembly/door_assembly_mai/glass
+	glass = 1
+
 //////////////////////////////////
 /*
 	Station Airlocks Mineral
@@ -216,6 +222,14 @@
 	overlays_file = 'icons/obj/doors/airlocks/external/overlays.dmi'
 	doortype = /obj/structure/door_assembly/door_assembly_ext
 
+/obj/machinery/door/airlock/glass_external
+	name = "external airlock"
+	icon = 'icons/obj/doors/airlocks/external/external.dmi'
+	overlays_file = 'icons/obj/doors/airlocks/external/overlays.dmi'
+	doortype = /obj/structure/door_assembly/door_assembly_ext/glass
+	opacity = 0
+	glass = 1
+
 //////////////////////////////////
 /*
 	Centcom Airlocks

code/game/objects/structures/door_assembly.dm

@@ -142,20 +142,30 @@
 	icon = 'icons/obj/doors/airlocks/station/maintenance.dmi'
 	typetext = "maintenance"
 	icontext = "mai"
+	glass_type = /obj/machinery/door/airlock/glass_maintenance
 	airlock_type = /obj/machinery/door/airlock/maintenance
 	anchored = 1
 	state = 1
 
+/obj/structure/door_assembly/door_assembly_mai/glass
+	mineral = "glass"
+	material = "glass"
+
 /obj/structure/door_assembly/door_assembly_ext
 	name = "external airlock assembly"
 	icon = 'icons/obj/doors/airlocks/external/external.dmi'
 	overlays_file = 'icons/obj/doors/airlocks/external/overlays.dmi'
 	typetext = "external"
 	icontext = "ext"
+	glass_type = /obj/machinery/door/airlock/glass_external
 	airlock_type = /obj/machinery/door/airlock/external
 	anchored = 1
 	state = 1
 
+/obj/structure/door_assembly/door_assembly_ext/glass
+	mineral = "glass"
+	material = "glass"
+
 /obj/structure/door_assembly/door_assembly_fre
 	name = "freezer airlock assembly"
 	icon = 'icons/obj/doors/airlocks/station/freezer.dmi'