Presumably the return journey is much more straightforward – there is no “goodbye” team (or whatever the opposite of welcome is ;) when leaving Alderney
No requirement for tests, vaccination certificates etc.
Also, Passenger Locator Forms are not required when travelling within the Common Travel Area.
(See this gov.uk webpage)
So I think you’d only need a flight plan and GAR form as in pre-COVID times – is that correct?
I think anyone planning to go “someday soon” needs to set up a profile on that .gg website because I read something about them having to approve it before you can use it.
Then a day or two before you travel you create a trip profile on it (can’t do it sooner than that).
Then call the reception team number and book yourself a slot.
And there is PPR with the tower of course 
Flight Plan, GAR form.
For the return, yes, GAR and a flight plan.
Once people have done this, let me know and we can do a fly-in
Why not go to Guernsey first and then go over to Alderney? It seems like the arrival appointments are only if you come from outside the Bailiwick of Guernsey.
The online form asks where you have been recently. And the same scheme is for both Guernsey and Alderney…
But you may be right that the “welcome team” is not then involved, or the Guernsey version of it is more time-flexible.
