diff --git a/include/plane.h b/include/plane.h
index 63fabceb..b0959663 100644
--- a/include/plane.h
+++ b/include/plane.h
@@ -105,9 +105,9 @@ struct plchrstr {
 #define P_S	bit(7)		/* Spy ability */
 #define P_I	bit(8)		/* Imaging ability (advanced spying) */
 #define P_O	bit(9)		/* Orbital ability (a satellite) */
-#define P_X	bit(10)		/* Stealth ability */
+/* unused	bit(10)	*/
 #define P_N	bit(11)		/* Nuclear RV interceptor (abm) */
-#define	P_H	bit(12)		/* Half stealthy */
+/* unused	bit(12)	*/
 #define P_E	bit(13)		/* extra light */
 #define P_K	bit(14)		/* chopper */
 #define P_A	bit(15)		/* ASW (Anti-Sub Warfare) */
diff --git a/src/lib/global/symbol.c b/src/lib/global/symbol.c
index 9b4d125e..705de42a 100644
--- a/src/lib/global/symbol.c
+++ b/src/lib/global/symbol.c
@@ -208,9 +208,7 @@ struct symbol plane_chr_flags[] = {
     {P_S, "spy"},
     {P_I, "image"},
     {P_O, "satellite"},
-    {P_X, "stealth"},
     {P_N, "SDI"},
-    {P_H, "half-stealth"},
     {P_E, "x-light"},
     {P_K, "helo"},
     {P_A, "ASW"},
diff --git a/src/lib/subs/aircombat.c b/src/lib/subs/aircombat.c
index 56b73889..8579e51c 100644
--- a/src/lib/subs/aircombat.c
+++ b/src/lib/subs/aircombat.c
@@ -780,10 +780,6 @@ ac_flak_dam(int guns, int def, int pl_flags)
     flak = guns - def;
     if ((pl_flags & P_T) == 0)
 	flak--;
-    if (pl_flags & P_X)
-	flak -= 2;
-    if (pl_flags & P_H)
-	flak -= 1;
 
     if (flak > 8)
 	mult = flaktable[FLAK_MAX];