In Portuguese periodical JN can read an article about the aerial linkings between Lisbon and Oporto. In it David Gering, director of marketing and sales of the Ryanair for Benelux and Portugal, is citing concerning the internal flights of the Ryanair. I think that it is very dificult because the routes between national airports, enclosed islands, had been attributed by public competition. In the beginning of September, the Ryanair, advanced that, inside of three years, it will be able to equate the hypothesis to carry through internal voos in Portugal.
You can see the article in JN site, but in Portuguese language. Sorry.
http://jn.sapo.pt/2006/10/08/tema_de...rrita_nor.html