Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-54.com. NS
Answer
awsdns-54.com. 5 NS g-ns-55.awsdns-54.com.
awsdns-54.com. 5 NS g-ns-1206.awsdns-54.com.
awsdns-54.com. 5 NS g-ns-630.awsdns-54.com.
awsdns-54.com. 5 NS g-ns-1782.awsdns-54.com.
Authority
The response has no authority records.
Additional
g-ns-55.awsdns-54.com. 5 A 205.251.192.55
g-ns-630.awsdns-54.com. 5 A 205.251.194.118
g-ns-1206.awsdns-54.com. 5 A 205.251.196.182
g-ns-1782.awsdns-54.com. 5 A 205.251.198.246
g-ns-55.awsdns-54.com. 5 AAAA 2600:9000:5300:3700:0:0:0:1
g-ns-630.awsdns-54.com. 5 AAAA 2600:9000:5302:7600:0:0:0:1
g-ns-1206.awsdns-54.com. 5 AAAA 2600:9000:5304:b600:0:0:0:1
g-ns-1782.awsdns-54.com. 5 AAAA 2600:9000:5306:f600:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0