Apex domains cannot have CNAME records.
Question and response
Question
dig travellisor.com. NS
Answer
travellisor.com. 5 NS ns-1454.awsdns-53.org.
travellisor.com. 5 NS ns-1031.awsdns-00.org.
travellisor.com. 5 NS ns-156.awsdns-19.com.
travellisor.com. 5 NS ns-1434.awsdns-51.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0