If it came to the piont when Newquay had to close (Unlikely) Air southwest might have to change their Gatwick service to :
A 2xDaily Dierct from Plymouth
or...
Change to Plymouth-Exeter-Gatwick
I don't really think it would effect Plymouth dramaticly but it will effect people in cornwall as i have heard it brings Millions to the local economy.
And they would have to travel to Plymouth and Exeter
WOWBOY