From d759f3a1adab17127903ae54180f8f121d33546f Mon Sep 17 00:00:00 2001
From: RogerLai <rlai@venasolutions.com>
Date: Tue, 5 Apr 2016 12:55:38 -0400
Subject: [PATCH] Added availability-zone filtering to instance collections

---
 moto/ec2/utils.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/moto/ec2/utils.py b/moto/ec2/utils.py
index 7ee924bb3..25c70ae8a 100644
--- a/moto/ec2/utils.py
+++ b/moto/ec2/utils.py
@@ -362,7 +362,8 @@ filter_dict_attribute_mapping = {
     'instance.group-id': 'security_groups',
     'instance-type': 'instance_type',
     'private-ip-address' : 'private_ip',
-    'ip-address' : 'public_ip'
+    'ip-address' : 'public_ip',
+    'availability-zone' :'placement'
 }