Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-54.org. NS
Answer
awsdns-54.org. 5 NS g-ns-760.awsdns-54.org.
awsdns-54.org. 5 NS g-ns-182.awsdns-54.org.
awsdns-54.org. 5 NS g-ns-1654.awsdns-54.org.
awsdns-54.org. 5 NS g-ns-1081.awsdns-54.org.
Authority
The response has no authority records.
Additional
g-ns-182.awsdns-54.org. 5 A 205.251.192.182
g-ns-760.awsdns-54.org. 5 A 205.251.194.248
g-ns-1081.awsdns-54.org. 5 A 205.251.196.57
g-ns-1654.awsdns-54.org. 5 A 205.251.198.118
g-ns-182.awsdns-54.org. 5 AAAA 2600:9000:5300:b600:0:0:0:1
g-ns-760.awsdns-54.org. 5 AAAA 2600:9000:5302:f800:0:0:0:1
g-ns-1081.awsdns-54.org. 5 AAAA 2600:9000:5304:3900:0:0:0:1
g-ns-1654.awsdns-54.org. 5 AAAA 2600:9000:5306:7600:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0