Apex domains cannot have CNAME records.
Question and response
Question
dig airclic.com. NS
Answer
airclic.com. 5 NS ns-34.awsdns-04.com.
airclic.com. 5 NS ns-533.awsdns-02.net.
airclic.com. 5 NS ns-1115.awsdns-11.org.
airclic.com. 5 NS ns-1635.awsdns-12.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0