Apex domains cannot have CNAME records.
Question and response
Question
dig lastminute.com. NS
Answer
lastminute.com. 4 NS ns-884.awsdns-46.net.
lastminute.com. 4 NS ns-1358.awsdns-41.org.
lastminute.com. 4 NS ns-1907.awsdns-46.co.uk.
lastminute.com. 4 NS ns-218.awsdns-27.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0