Whilst ignoring the juvenile(s)
What does that mean?
were I to live around Plymouth, I could fly out on a breakfast time flight and, via a connection, be at a European destination by lunchtime and I'd be able to catch an evening flight back to Devon.
But evidently enough people didn't think like you, and as I stated, two flights a day from Plymouth to London for the domestic market cannot compete with the train frequency, even if the flights are quicker (depending on which bit of London you want to go to).
I'm certainly not knocking Plymouth and will be sad to see it closed - hell, you can see from my address there's enough worries about my local airport; but sometimes the sheer tide of market economy floods over our ideal scenarios.