Certainly don't feel the likes of TCX THOM will want to come here but potentially a company similar to Seguro could do well. It worked in the past and travellers as far as Edinburgh did travel to PIK in numbers.
Good point, in those days they would cross the country for a good deal, nowadays that good deal is more likely to be available from EDI as well. Ryanair and easyJet etc killed that sort of business model. The only think PIK can compete against GLA on is cost, not one other thing. Dumfries and Galloway lies firmly in GLA's catchment area and with the critical mass of more destinations available, it will always take the lion's share, leaving PIK the scraps.
That's a lot of business for the airport to be targeting, and is certainly enough to sustain some kind of passenger operations, especially combined with a share of the 5.9 million trips made by the central belt catchment area in the same year.
UK Outbound Market :
Thomson, Jet2, Thomas Cook, Virgin - all are happiliy using GLA with facilities like lounges with daylight and stands with airbridges. PIK cannot begin to offer this. TOM, TCX and LS have crew bases and history and see nothing in splitting ops or moving to PIK.
US Transatlantic :
UA, DL, AA not a chance, PIK cannot compete with GLA for premium business, it would use EDI before PIK
Canada Transatlantic :
Transat have a long history at GLA after moving out of PIK and need to compete with Rouge and Westjet who have joined the market. Westjet may have been an option but chose GLA. Potential others I have missed?
Inbound short haul :
Used to see Transavia once a week but ad-hoc business like this can't make a profit on PIK's cost base.
If you try and nail down who is even slightly likely to use PIK in this market for passengers, the list is vanishly small when GLA is up the road with competitive pricing and way better facilities.
All PIK can offer is "much cheapness" to Ayrshire outbound sun travellers and GLA is also all over that one.