Originally Posted by
Koby
When flying to GIB you go through the exact same procedure/route as when flying to LIS to MAD? It's an honest question; I really do not know. (I do not even know how a flight to the EU works these days. I have not been to the UK since Brexit.)
The UK treats GIB as an international destination, it's not a "domestic" flight. Spain requires API from incoming flights, a flight to Gibraltar would not submit API to Spain, but of course weather-related diversions to AGP are nothing new.
When ETIAS comes in, assuming the UK isn't going to relent and accept a third party making decisions on British citizens being able to enter a British territory (as there is a plan that Gibraltar could join Schengen), then you would need one to enter Spain but not to enter Gibraltar.
I don't know if Gibraltar is going to be part of the UK ETA or have its own at some point... but when that comes in, non-British and non-Irish without UK residency would need a UK ETA to fly from GIB to the UK.