diff --git a/include/plane.h b/include/plane.h
index 5c82a501..d9384c32 100644
--- a/include/plane.h
+++ b/include/plane.h
@@ -172,7 +172,7 @@ extern void ac_planedamage(struct plist *, natid, int, natid, int,
 extern void ac_intercept(struct emp_qelem *, struct emp_qelem *,
 			 struct emp_qelem *, natid, coord, coord);
 extern void ac_combat_headers(natid, natid);
-extern void ac_airtoair(struct emp_qelem *, struct emp_qelem *, natid);
+extern void ac_airtoair(struct emp_qelem *, struct emp_qelem *);
 extern void ac_doflak(struct emp_qelem *, struct sctstr *);
 extern void ac_shipflak(struct emp_qelem *, coord, coord);
 extern void ac_landflak(struct emp_qelem *, coord, coord);
diff --git a/src/lib/subs/aircombat.c b/src/lib/subs/aircombat.c
index 237e091e..090d8720 100644
--- a/src/lib/subs/aircombat.c
+++ b/src/lib/subs/aircombat.c
@@ -98,7 +98,6 @@ ac_encounter(struct emp_qelem *bomb_list, struct emp_qelem *esc_list,
     struct shiplook head;
     struct shiplook *s, *s2;
     int changed = 0;
-    int intx, inty;		/* Last sector planes intercepted over */
     int intown = 0;		/* Last owner to intercept */
 /* We want to only intercept once per sector per owner.  So, if we overfly
    a sector, and then overfly some land units or ships, we don't want to
@@ -256,8 +255,6 @@ ac_encounter(struct emp_qelem *bomb_list, struct emp_qelem *esc_list,
 	    continue;
 	ac_intercept(bomb_list, esc_list, &ilist[sect.sct_own],
 		     sect.sct_own, x, y);
-	intx = x;
-	inty = y;
 	intown = sect.sct_own;
     }
 
@@ -511,8 +508,8 @@ ac_intercept(struct emp_qelem *bomb_list, struct emp_qelem *esc_list,
     PR(def_own, "%d fighter%s intercepting %s planes!\n", icount,
        icount == 1 ? " is" : "s are", cname(plane_owner));
     ac_combat_headers(plane_owner, def_own);
-    ac_airtoair(esc_list, &int_list, def_own);
-    ac_airtoair(bomb_list, &int_list, def_own);
+    ac_airtoair(esc_list, &int_list);
+    ac_airtoair(bomb_list, &int_list);
     PR(plane_owner, "\n");
     PR(def_own, "\n");
 }
@@ -532,8 +529,7 @@ ac_combat_headers(natid plane_owner, natid def_own)
  * air-to-air combat.
  */
 void
-ac_airtoair(struct emp_qelem *att_list, struct emp_qelem *int_list,
-	    natid def_own)
+ac_airtoair(struct emp_qelem *att_list, struct emp_qelem *int_list)
 {
     struct plist *attacker;
     struct plist *interceptor;
@@ -544,7 +540,6 @@ ac_airtoair(struct emp_qelem *att_list, struct emp_qelem *int_list,
     int more_int;
     struct emp_qelem *att_next;
     struct emp_qelem *in_next;
-    natid att_own;
 
     att = att_list->q_forw;
     in = int_list->q_forw;
@@ -574,8 +569,6 @@ ac_airtoair(struct emp_qelem *att_list, struct emp_qelem *int_list,
 	    continue;
 	}
 	interceptor = (struct plist *)in;
-	att_own = attacker->plane.pln_own;
-	def_own = interceptor->plane.pln_own;
 	nplanes = attacker->plane.pln_effic;
 	if (nplanes > interceptor->plane.pln_effic)
 	    nplanes = interceptor->plane.pln_effic;
diff --git a/src/lib/subs/mission.c b/src/lib/subs/mission.c
index 577ddf95..137b6787 100644
--- a/src/lib/subs/mission.c
+++ b/src/lib/subs/mission.c
@@ -140,12 +140,10 @@ only_subs(struct emp_qelem *list)
 {
     struct emp_qelem *qp;
     struct genlist *glp;
-    struct genitem *gp;
     struct mchrstr *mcp;
 
     for (qp = list->q_forw; qp != list; qp = qp->q_forw) {
 	glp = (struct genlist *)qp;
-	gp = (struct genitem *)glp->thing;
 
 	if (glp->type != EF_SHIP)
 	    return 0;
@@ -442,7 +440,6 @@ perform_mission(coord x, coord y, natid victim, struct emp_qelem *list,
     struct lndstr *lp;
     struct shpstr *sp;
     struct sctstr sect;
-    struct lchrstr *lcp;
     struct mchrstr *mcp;
     struct plchrstr *pcp;
     int dam = 0, dam2, mission_flags, tech;
@@ -465,7 +462,6 @@ perform_mission(coord x, coord y, natid victim, struct emp_qelem *list,
 
 	if (glp->type == EF_LAND) {
 	    lp = (struct lndstr *)glp->thing;
-	    lcp = (struct lchrstr *)glp->cp;
 
 	    if (lp->lnd_effic < LAND_MINFIREEFF)
 		continue;
@@ -1681,7 +1677,7 @@ air_defense(coord x, coord y, natid victim, struct emp_qelem *bomb_list,
 		mpr(victim, "%s air defense planes intercept!\n",
 		    cname(cn));
 		ac_combat_headers(victim, cn);
-		ac_airtoair(esc_list, &i, air->own);
+		ac_airtoair(esc_list, &i);
 		combat = 1;
 	    }
 	    /* Now intercept the bombers */
@@ -1691,7 +1687,7 @@ air_defense(coord x, coord y, natid victim, struct emp_qelem *bomb_list,
 			cname(cn));
 		    ac_combat_headers(victim, cn);
 		}
-		ac_airtoair(bomb_list, &i, air->own);
+		ac_airtoair(bomb_list, &i);
 		PR(cn, "\n");
 		PR(victim, "\n");
 	    }