Apex domains cannot have CNAME records.
Question and response
Question
dig comfortinnphiladelphia.com. NS
Answer
comfortinnphiladelphia.com. 1 NS dns4.p01.nsone.net.
comfortinnphiladelphia.com. 1 NS dns1.p05.nsone.net.
comfortinnphiladelphia.com. 1 NS dns2.p08.nsone.net.
comfortinnphiladelphia.com. 1 NS dns3.p13.nsone.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0