I think people are forgetting something, especially Mr A Tis. What about the people in Oldam, Rochdale etc? It certainly isn't 25 miles to LPL from there and LBA/DSA don't offer the destinations that are on offer from LPL as an alternative to MAN. Yes, it is ok if you live in St. Helens, Warrington etc. where there is a choice for both but MAN is and always will be, the main airport.
I find it hard to believe that a service to the Spanish capital won't work where Barcelona
region has 3x daily BCN and soon to be 18x weekly GRO from the
region. You say that EZY/FR won't use same routes from both airports, please explain: GRO (FR - MAN, LPL, BLK), BGY (FR - MAN, LPL), DUB (MAN, LPL, BLK), SNN (MAN, LPL), AGP (EZY - MAN, LPL) or are we jus ignoring them?
The reason these routes are working is that they have DEMAND. And other routes will also be able to work becuase not everyone lives between LPL and MAN! There is East of MAN!