Ryanair UK ?
 

In the event of any kind of Brexit one assumes Ryanair would be unlikely to be allowed cabotage rights making G reg a necessity if they are not to lose all their UK business to anywhere except Ireland.

An interesting development though from the point of view of union membership, working practices, duty hours etc.

Post Brexit they may only need one aircraft to service the UK - bringing in the UN, the Red Cross and the IMF............................ :cool:

More Brexit scaremongering here I see - The CAA will treat any EASA airline as having met the required safety standard automatically, and vice-versa. That will allow flights to continue as prior to 29th March regardless of the type of Brexit that happens.

Those moves are more to do with the registered location of assets for taxation and financial reporting reasons moreso than to do with potential changes and/or problems with aviation regulations.

Easyjet's moves, as you've mentioned, are because in the event of a no-deal Brexit, the tariffs that would become due would be astronomical. It makes perfect sense to operate their European flights from a European-based subsidiary for that reason. Ryanair are doing slightly the reverse, in that they have recently established a UK subsidiary which will pay its taxes to the UK Government for any declared UK business activities, as opposed to the current setup where it pays all of its taxes to the Irish Government. Again, I suspect this is a tariff avoidance scheme.

Incorrect unfortunately, as already described by others. As there are more costs involved and worse taxation arrangements due to the complexity and duplicity, as well as crews being not allowed to operate each others fleet without transition courses in place. The logistical nightmare is also much more costly than the solution of maintaining a single regulatory agency involved. The ONLY reason Ryanar has done this is to remain active in UK domestic market in all scenarios. Depending on aviation arrangements agreed during Brexit, there may be many more registrations to follow (possibly all UK based aircraft and crews to transition onto UK AOC).
Incorrect unfortunately again, easyJet would NOT BE ALLOWED to operate intra Eu flights unless flown on an EU register, as these rights are not granted through the Brexit divorce arrangements, they are fundamentals of EU membership which the UK decides to leave behind.

Quite arrogant sounding here. What exactly do you think an Austrian AOC is for?

Skyjob is entirely correct.

Its nothing to do with where the aircraft is registered. Its whether you have an 83 bis arrangement in place. That's World-wide. Nowt to do with EU.