Despite all those staycations, the Channel Islands are as close as you get to the UK when it comes to water-surrounded land masses: you prefer to cast your net wider, to the warmer Indian Ocean, Caribbean or Mediterranean – and, increasingly, as far as the Philippines, which has more than 7,600 islands to choose between. The Greek Islands were the classical winners though, and this year’s overall number one, scoring highly for scenery and people, though Sicily’s food was tastier and the Maldives has better places to stay.
Since airline reservation requests are often made by city-pair (such as "show me flights from Chicago to Düsseldorf"), an airline that can codeshare with another airline for a variety of routes might be able to be listed as indeed offering a Chicago–Düsseldorf flight. The passenger is advised however, that airline no. 1 operates the flight from say Chicago to Amsterdam, and airline no. 2 operates the continuing flight (on a different airplane, sometimes from another terminal) to Düsseldorf. Thus the primary rationale for code sharing is to expand one's service offerings in city-pair terms to increase sales.