diff --git a/games/atc/def.h b/games/atc/def.h
index a27266dd32eb..cb19256cf6a3 100644
--- a/games/atc/def.h
+++ b/games/atc/def.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: def.h,v 1.6 2003/08/07 09:36:53 agc Exp $	*/
+/*	$NetBSD: def.h,v 1.7 2014/03/22 22:58:56 dholland Exp $	*/
 
 /*-
  * Copyright (c) 1990, 1993
@@ -65,11 +65,6 @@
 #define D_UP		3
 #define D_DOWN		4
 
-#define T_NODEST	0
-#define T_BEACON	1
-#define T_EXIT		2
-#define T_AIRPORT	3
-
 #undef S_NONE
 #undef S_GONE
 #undef S_MARKED
diff --git a/games/atc/extern.h b/games/atc/extern.h
index 2b23e4b4f62c..7131a6a39365 100644
--- a/games/atc/extern.h
+++ b/games/atc/extern.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: extern.h,v 1.16 2009/08/12 04:48:03 dholland Exp $	*/
+/*	$NetBSD: extern.h,v 1.17 2014/03/22 22:58:56 dholland Exp $	*/
 
 /*-
  * Copyright (c) 1990, 1993
@@ -61,7 +61,7 @@ extern struct termios	tty_start, tty_new;
 
 extern DISPLACEMENT	displacement[MAXDIR];
 
-int		addplane(void);
+void		addplane(void);
 void		append(LIST *, PLANE *);
 void		check_adir(int, int, int);
 void		delete(LIST *, PLANE *);
diff --git a/games/atc/input.c b/games/atc/input.c
index 1513c2a44e62..500af29b18f7 100644
--- a/games/atc/input.c
+++ b/games/atc/input.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: input.c,v 1.27 2014/03/22 22:47:07 dholland Exp $	*/
+/*	$NetBSD: input.c,v 1.28 2014/03/22 22:58:56 dholland Exp $	*/
 
 /*-
  * Copyright (c) 1990, 1993
@@ -46,7 +46,7 @@
 #if 0
 static char sccsid[] = "@(#)input.c	8.1 (Berkeley) 5/31/93";
 #else
-__RCSID("$NetBSD: input.c,v 1.27 2014/03/22 22:47:07 dholland Exp $");
+__RCSID("$NetBSD: input.c,v 1.28 2014/03/22 22:58:56 dholland Exp $");
 #endif
 #endif /* not lint */
 
@@ -199,7 +199,8 @@ static PLANE p;
 static STACK stack[MAXDEPTH];
 static int level;
 static int tval;
-static int dest_type, dir;
+static int dir;
+static enum places dest_type;
 static unsigned dest_no;
 
 static int
diff --git a/games/atc/main.c b/games/atc/main.c
index 536c0ef6c5f0..7f4444fb5490 100644
--- a/games/atc/main.c
+++ b/games/atc/main.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: main.c,v 1.21 2012/10/12 10:44:20 dholland Exp $	*/
+/*	$NetBSD: main.c,v 1.22 2014/03/22 22:58:56 dholland Exp $	*/
 
 /*-
  * Copyright (c) 1990, 1993
@@ -51,7 +51,7 @@ __COPYRIGHT("@(#) Copyright (c) 1990, 1993\
 #if 0
 static char sccsid[] = "@(#)main.c	8.1 (Berkeley) 5/31/93";
 #else
-__RCSID("$NetBSD: main.c,v 1.21 2012/10/12 10:44:20 dholland Exp $");
+__RCSID("$NetBSD: main.c,v 1.22 2014/03/22 22:58:56 dholland Exp $");
 #endif
 #endif /* not lint */
 
@@ -144,7 +144,7 @@ main(int argc, char *argv[])
 	init_gr();
 	setup_screen(sp);
 
-	(void)addplane();
+	addplane();
 
 	(void)signal(SIGINT, quit);
 	(void)signal(SIGQUIT, quit);
diff --git a/games/atc/struct.h b/games/atc/struct.h
index ad5361ddc5dd..52ba1dcf7bdb 100644
--- a/games/atc/struct.h
+++ b/games/atc/struct.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: struct.h,v 1.9 2014/03/22 22:45:05 dholland Exp $	*/
+/*	$NetBSD: struct.h,v 1.10 2014/03/22 22:58:56 dholland Exp $	*/
 
 /*-
  * Copyright (c) 1990, 1993
@@ -72,15 +72,22 @@ typedef struct {
 	AIRPORT	*airport;
 } C_SCREEN;
 
+enum places {
+	T_NODEST = 0,
+	T_BEACON = 1,
+	T_EXIT = 2,
+	T_AIRPORT = 3
+};
+
 typedef struct plane {
 	struct plane	*next, *prev;
 	int		status;
 	int		plane_no;
 	int		plane_type;
-	int		orig_no;
-	int		orig_type;
-	int		dest_no;
-	int		dest_type;
+	unsigned orig_no;
+	enum places orig_type;
+	unsigned dest_no;
+	enum places dest_type;
 	int		altitude;
 	int		new_altitude;
 	int		dir;
diff --git a/games/atc/update.c b/games/atc/update.c
index 52cf5ff61e99..4396aabaaead 100644
--- a/games/atc/update.c
+++ b/games/atc/update.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: update.c,v 1.24 2014/03/22 22:45:05 dholland Exp $	*/
+/*	$NetBSD: update.c,v 1.25 2014/03/22 22:58:56 dholland Exp $	*/
 
 /*-
  * Copyright (c) 1990, 1993
@@ -46,7 +46,7 @@
 #if 0
 static char sccsid[] = "@(#)update.c	8.1 (Berkeley) 5/31/93";
 #else
-__RCSID("$NetBSD: update.c,v 1.24 2014/03/22 22:45:05 dholland Exp $");
+__RCSID("$NetBSD: update.c,v 1.25 2014/03/22 22:58:56 dholland Exp $");
 #endif
 #endif /* not lint */
 
@@ -217,7 +217,7 @@ update(int dummy __unused)
 	 * we don't update props on odd updates.
 	 */
 	if ((rand() % sp->newplane_time) == 0)
-		(void)addplane();
+		addplane();
 
 #ifdef SYSV
 	alarm(sp->update_secs);
@@ -233,14 +233,14 @@ command(const PLANE *pp)
 	buf[0] = '\0';
 	bp = buf;
 	bpsize = sizeof(buf);
-	(void)snprintf(bp, bpsize, "%c%d%c%c%d: ", name(pp), pp->altitude, 
+	(void)snprintf(bp, bpsize, "%c%d%c%c%u: ", name(pp), pp->altitude, 
 		(pp->fuel < LOWFUEL) ? '*' : ' ',
 		(pp->dest_type == T_AIRPORT) ? 'A' : 'E', pp->dest_no);
 
 	comm_start = bp = strchr(buf, '\0');
 	bpsize = buf + sizeof(buf) - bp;
 	if (pp->altitude == 0)
-		(void)snprintf(bp, bpsize, "Holding @ A%d", pp->orig_no);
+		(void)snprintf(bp, bpsize, "Holding @ A%u", pp->orig_no);
 	else if (pp->new_dir >= MAXDIR || pp->new_dir < 0)
 		(void)snprintf(bp, bpsize, "Circle");
 	else if (pp->new_dir != pp->dir)
@@ -308,7 +308,7 @@ next_plane(void)
 	return (last_plane);
 }
 
-int
+void
 addplane(void)
 {
 	PLANE	p, *pp, *p1;
@@ -363,10 +363,10 @@ addplane(void)
 		break;
 	}
 	if (i >= num_starts)
-		return (-1);
+		return;
 	pnum = next_plane();
 	if (pnum < 0)
-		return (-1);
+		return;
 	p.plane_no = pnum;
 
 	pp = newplane();
@@ -378,8 +378,6 @@ addplane(void)
 		append(&ground, pp);
 	else
 		append(&air, pp);
-
-	return (pp->dest_type);
 }
 
 PLANE *