Re comments of an IOM route by easyJet, it's highly irrelevant that Citywing don't fill a 19 seater. The fact is that the final seats available on the aircraft come at a high price, as is the case with easyJet's model. However, there is no doubt easyJet could significant grow the market between IOM and NCL.
Routes like IOM LPL, BRS IOM are short block times hence if a rotation can be fitted in with no requirement for extra aircraft or cuts to other services, the maths could stack on a marginal costing basis . That said I feel it would be a stretch.
The largest markets ex IOM not touched by direct competition are Manchester and Belfast, and without multiple daily frequencies , simply won't stack for easyJet. Citywing did a fine job at seeing off Logan off the IOM BHD route before.