The US could deny airlines which don't implement the ban entry into US airspace. The US could also forbid them from landing in the US. The US could also raid th

The US could deny airlines which don't implement the ban entry into US airspace. The US could also forbid them from landing in the US. The US could also raid the planes after landing or arrest anyone carrying a laptop bag that wasn't checked in as luggage. The US could do any of these things and there would be nothing the EU could do about it because they all would happen outside EU jurisdiction. As a European citizen I'm not sure what you believe the EU could practically do to prevent such a ban as long as it is only about flights into the US or within the US. It's literally none of our business.