Apex domains cannot have CNAME records.
Question and response
Question
dig ainain.org. NS
Answer
ainain.org. 5 NS ns-316.awsdns-39.com.
ainain.org. 5 NS ns-375.awsdns-46.com.
ainain.org. 5 NS ns-712.awsdns-25.net.
ainain.org. 5 NS ns-1401.awsdns-47.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0