You’d have to check the schedule for your specific dates but I think Santorini then Milos then Paros then Naxos and Athens would probably be the best order. 3 days in each sounds great. Or a small tweak: 2 days in Milos and then 4 days in Santorini (splitting time between 2 of the 4 caldera towns) or even 4 days in Paros (splitting time between Naousa and Parikia).
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.
I loved you website, congratulations. Me, my wife and a couple of friends are traveling to Greece in march/2018 (I know it’s not the best time of the year to visit Greece, but it’s the time we have available). We are in our late 30’s and are looking forward to some beautiful views, chill out time and good food. We’re not after huge parties but some local music wouldn’t be bad. We have 13 days in our hands, so by reading your texts I’m considering spending some 2 days in Athens, 3 days in Mykonos, 4 days in Santorini, 4 days in Chania.
Between Nydri and the next main tourism centre is the little port and beach of Mikros Gialos (small bay) that is a great little base for individual travellers for a day or three. The port village of Vasiliki on the southern underbelly of Lefkada is a haven for windsurfers: see this page or this one for more information. The little village is very pretty and is a good base for general holiday-making (as are the two other places). From Vasiliki there is a regular local ferry that runs to Fiskardo on Kefallonia (via Ithaca/Ithaki).
In Finland, the charter establishing Aero O/Y (now Finnair) was signed in the city of Helsinki on September 12, 1923. Junkers F.13 D-335 became the first aircraft of the company, when Aero took delivery of it on March 14, 1924. The first flight was between Helsinki and Tallinn, capital of Estonia, and it took place on March 20, 1924, one week later.
A complicating factor is that of origin-destination control ("O&D control"). Someone purchasing a ticket from Melbourne to Sydney (as an example) for A$200 is competing with someone else who wants to fly Melbourne to Los Angeles through Sydney on the same flight, and who is willing to pay A$1400. Should the airline prefer the $1400 passenger, or the $200 passenger plus a possible Sydney-Los Angeles passenger willing to pay $1300? Airlines have to make hundreds of thousands of similar pricing decisions daily.