Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-09.org. NS
Answer
awsdns-09.org. 5 NS g-ns-715.awsdns-09.org.
awsdns-09.org. 5 NS g-ns-1036.awsdns-09.org.
awsdns-09.org. 5 NS g-ns-1609.awsdns-09.org.
awsdns-09.org. 5 NS g-ns-137.awsdns-09.org.
Authority
The response has no authority records.
Additional
g-ns-137.awsdns-09.org. 5 A 205.251.192.137
g-ns-715.awsdns-09.org. 5 A 205.251.194.203
g-ns-1036.awsdns-09.org. 5 A 205.251.196.12
g-ns-1609.awsdns-09.org. 5 A 205.251.198.73
g-ns-137.awsdns-09.org. 5 AAAA 2600:9000:5300:8900:0:0:0:1
g-ns-715.awsdns-09.org. 5 AAAA 2600:9000:5302:cb00:0:0:0:1
g-ns-1036.awsdns-09.org. 5 AAAA 2600:9000:5304:c00:0:0:0:1
g-ns-1609.awsdns-09.org. 5 AAAA 2600:9000:5306:4900:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0