Originally Posted by
a350pilots
You forget that the UK CAA of past is not the same CAA of the present.
Much manpower and resources had been outsourced to EASA.
Your argumentation is therefore flawed.
The Royal Aeronautical Society has
published a thorough report on the options and challenges for the CAA, not only focusing on no deal, but mentioning it. They calculate that around 300 specialist staff have to be hired and trained, as well a needed transition period of at least several years to transfer back all the responsibility. That would not be there in April 2019 at all.
Even if there is no deal in general, i expect there will be some side deals after that is decided for specific areas including aviation, as that would be damaging to both sides, although much more so for the UK than the EU.