Apex domains cannot have CNAME records.
Question and response
Question
dig onlinetravelinfobase.com. NS
Answer
onlinetravelinfobase.com. 5 NS ns-427.awsdns-53.com.
onlinetravelinfobase.com. 5 NS ns-877.awsdns-45.net.
onlinetravelinfobase.com. 5 NS ns-896.awsdns-48.net.
onlinetravelinfobase.com. 5 NS ns-150.awsdns-18.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0