Amethyst.
You've been listening to too much anti-Brexit scaremongering!
A Brexit would make no difference to the UK's membership of the open skies area, which also includes non-EU Morocco and Israel.
I think you may be mistaken. though not for the first two years after a UK vote to leave the EU, during which, of course, a continuation of the deal may be made - though this may well require UK to sign up to the EEA, and the conditions that are attached to that.
Returning to the Monarch issue, I would suggest that every business is for sale, if the right offer comes along