The CAA can't "take an aircraft from Viking and operate it to Rhodes". Who would crew it? What engineers would service it? Who would insure it? If it is operating back from RHO whos AOC would it fly on?
Do you mean the aircraft was operated empty to RHO by Viking at the request of the CAA to bring passengers back? - although that doesn't agree with the information on the CAA website which says that all Kiss flights passengers booked on flights up until 1800 today would travel out as booked I suspect it is more likely.