diff --git a/libcxx/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_double.pass.cpp b/libcxx/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_double.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_double.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_double.pass.cpp
@@ -28,8 +28,6 @@
 //   https://developercommunity.visualstudio.com/t/Printf-formatting-of-float-as-hex-prints/1660844
 // XFAIL: msvc
 
-// XFAIL: LIBCXX-AIX-FIXME
-
 #include <locale>
 #include <ios>
 #include <cassert>
@@ -17892,7 +17890,11 @@
     test4();
     test5();
     test6();
+#ifndef _AIX
+    // AIX libc will output -0x0.0p+0 for hexfloat -0., regardless of showpoint.
+    // This invalidates all the asserts in test7.
     test7();
+#endif
     test8();
 
   return 0;
diff --git a/libcxx/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long_double.pass.cpp b/libcxx/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long_double.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long_double.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long_double.pass.cpp
@@ -28,8 +28,6 @@
 //   https://developercommunity.visualstudio.com/t/Printf-formatting-of-float-as-hex-prints/1660844
 // XFAIL: msvc
 
-// XFAIL: LIBCXX-AIX-FIXME
-
 #include <locale>
 #include <ios>
 #include <cassert>
@@ -26219,14 +26217,22 @@
     test1();
     test2();
     test3();
+#ifndef _AIX
+    // AIX will print INF for inf and NaNQ for nan regardless of uppercase.
+    // This invalidates all asserts in test4 anf test5.
     test4();
     test5();
+#endif
     test6();
     test7();
     test8();
     test9();
     test10();
+#ifndef _AIX
+    // AIX will print -0x0.0p for -0. regardless of showpoint.
+    // This invalidates all asserts in test11.
     test11();
+#endif
     test12();
     std::locale lc = std::locale::classic();
     std::locale lg(lc, new my_numpunct);