1.3V,
On a couple of specific matters, such as CAA, AAIB, etc, these are actually covered in the SNP 600 odd page document. Their basic plan is to continue using the UK facilities after independence, through such arrangements as memorandum of understanding, etc. They even expect to put Scottish representatives in there for governance and to report back.
Several things spring to mind. Is this true independence? No mention of paying for the service. This plan also relies on the rUK agreeing to numerous concessions, with little or nothing in return, through amicable negotiations.
If Scotland becomes independent from the UK I would liken it to a divorce, it will get messy and acrimonious. The SNP document treats it more like a favoured child going off to university, yes they have gone, but they still come home at weekends and expect to borrow their parents car, use the washing machine, keep a shelf in the fridge, etc....without of course paying for the petrol, electricity....