Apex domains cannot have CNAME records.
Question and response
Question
dig rmdaircraft.com. NS
Answer
rmdaircraft.com. 4 NS ns-1129.awsdns-13.org.
rmdaircraft.com. 4 NS ns-1399.awsdns-46.org.
rmdaircraft.com. 4 NS ns-1073.awsdns-06.org.
rmdaircraft.com. 4 NS ns-1154.awsdns-16.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0