virgin,
Exactly the point ... these destinations cannot be successfully served by 78 seater aircraft .... believe it or not but these aeroplane wizz kids manufacture 18 seater, 30 something seater, any idea what the '42' in 'ATR42' signifies? ... and so on.
When it comes to aviation, and with all due respect, Cornwall is a village, it is not a City Centre!
The public always has a choice ... National Express ... Railway ... EXT ... BRS ... BHX ... and ... 'London'.