Think Theresa May has already done that with a hard Brexit look at the £v$€¥. The ending of free movement is the biggest threat to Scottish Airports in a life time. From the numbers of EU nationals employed at the airport, EU staff (pilots/cabin crew) working for airlines living in the U.K. and actually EU Pax filling seats on planes. Regulation of flights, will there be freedom rights. Intl flights from Dundee, Inverness & Kirkwall will end as they'll not get permission (currently an airline from the EU doesn't need permission from the Home Office, as it costs money to staff airports with Border Force would they agree to provide them). GA flights to Europe controlled & full passport checks on Eire flights. Ryanair unable to run Domestic flights. Norwegian unable to fly EDI to USA as an EU carrier. Do I need to go on. The Independence vote is a vote so Scotland can keep things like these! The Westminster government has said that it'll go to WTO rules as a default if no agreement. I for one, who works at Scottish Airports are worried about Brexit not Scottish Independence!
It's ok we're going back to the 50's and owning the Commonwealth!