Could CX order all logo visible images removed? Probably. In fact, CO, DL, NW, VS, and AC all could as well. Does this mean they will? Probably not unless they have a good and logical reason to. Some airlines tend to care more about logo/image useage than others. It just depends, but it's a right they have...
Cathay or any other airline, or any other business in the U.S. cannot "order" a private citizen, which is what any VA is, or any other business to stop using trademarks and brands. Just like we cannot order someone else to do something within any legal standing. If SimAirline.net was to use CX marks and brands they simply cannot "force" us to stop using them. What a company does is send out there lawyers with their nasty attitudes and their "cease and desist" letters threatening lawsuits. And, a lawsuit would only be successful if they can demonstrate that a VA's use of trademarks "harmed" them in some way, which we obviously are not doing. To harm them would have to occur in the business arena not the flight sim world. They know this so they send out their lawyers and more often than not people see them coming and stop because they don't need the headache. But the dirty little secret in U.S. law is that the plaintiff (the airline) would have to sue the defendant (a VA like us), engage in a timely, costly, lawsuit, and then prove they have been harmed. Good luck proving that. And then only a judge can "order" a VA to cease and desist.
When you go international, it gets even more unlikely they can do anything.
It still boggles my mind when I hear real airlines fighting the VAs since are "celebrating" them, not the opposite. In fact, some VAs have been known to get endorsed by their real world counterpart and even let them use server space (United-Virtual). Go figure