Lefkada is an island, but is connected to the mainland by a causeway at the northern tip and its access airport is on the mainland at Aktio (Preveza). It is an island popular with Greeks and mainly European visitors. Italians and Brits predominate. It is green, verdant, has good beaches and facilities and is compact enough to get around easily. Tourism is centred on the east coast around the port village of Nydri. It is low-key accommodation with villas and small family-run hotels predominating. Off-shore from Nydri are a couple of islands worth visiting on excursions: the sizeable Meganisi (car ferries run to and fro’) and the private Skorpios Island which belong to the Onassis family. On your own hired motor boat, you can heave-to on just one private beach on the north side of the island and swim and claim boasting rights to having swum on Aristotle Onassis’ private piece of Greece.
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.