Apex domains cannot have CNAME records.
Question and response
Question
dig travelliser.com. NS
Answer
travelliser.com. 5 NS ns-1908.awsdns-46.co.uk.
travelliser.com. 5 NS ns-991.awsdns-59.net.
travelliser.com. 5 NS ns-163.awsdns-20.com.
travelliser.com. 5 NS ns-2036.awsdns-62.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0