Yes but in what direction have the discussions taken place? It's like a salesman knocking on your door, if the product sounds mildly interesting then you'll sit there and listen. The master plan is bound to state the presence of a LCC because that's what SOU airport wants but whether the LCCs want SOU airport is an entirely different kettle of fish. Airlines evaluate airports all the time for viability, isn't it telling that SOU hasn't really attracted anyone major flying major, frequent routes for years and years, much the same as BOH hasn't? There's a reason why airlines aren't in these airports in abundance, it's not like SOU airport is going to approach easyjet, Ryanair etc and then those airlines say "oh yeah, operate from SOU airport, why didn't we think of that?".