Apex domains cannot have CNAME records.
Question and response
Question
dig saint-cyr-aviation-partage.org. NS
Answer
saint-cyr-aviation-partage.org. 5 NS ns-1151.awsdns-15.org.
saint-cyr-aviation-partage.org. 5 NS ns-999.awsdns-60.net.
saint-cyr-aviation-partage.org. 5 NS ns-236.awsdns-29.com.
saint-cyr-aviation-partage.org. 5 NS ns-1656.awsdns-15.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0