Apex domains cannot have CNAME records.
Question and response
Question
dig tomsairlines.com. NS
Answer
tomsairlines.com. 5 NS ns-1264.awsdns-30.org.
tomsairlines.com. 5 NS ns-1017.awsdns-63.net.
tomsairlines.com. 5 NS ns-46.awsdns-05.com.
tomsairlines.com. 5 NS ns-1504.awsdns-60.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0