Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-61.com. NS
Answer
awsdns-61.com. 5 NS g-ns-62.awsdns-61.com.
awsdns-61.com. 5 NS g-ns-1213.awsdns-61.com.
awsdns-61.com. 5 NS g-ns-637.awsdns-61.com.
awsdns-61.com. 5 NS g-ns-1789.awsdns-61.com.
Authority
The response has no authority records.
Additional
g-ns-62.awsdns-61.com. 5 A 205.251.192.62
g-ns-637.awsdns-61.com. 5 A 205.251.194.125
g-ns-1213.awsdns-61.com. 5 A 205.251.196.189
g-ns-1789.awsdns-61.com. 5 A 205.251.198.253
g-ns-62.awsdns-61.com. 5 AAAA 2600:9000:5300:3e00:0:0:0:1
g-ns-637.awsdns-61.com. 5 AAAA 2600:9000:5302:7d00:0:0:0:1
g-ns-1213.awsdns-61.com. 5 AAAA 2600:9000:5304:bd00:0:0:0:1
g-ns-1789.awsdns-61.com. 5 AAAA 2600:9000:5306:fd00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0