Er, no. Or not at T5, which is the example that you were giving. IIRC, an arriving passenger can't go into the airside departures area without a conformance check for a valid onward boarding pass - and this is pretty much hardwired into the T5 systems as part of BA's procedures. So your solution for scenario 3 would involve having a conformance check at the top of the jetway of every gate that could be used for this. And it would create a wonderful anomaly between international "secure" -> international connections, and international "secure" -> domestic connections: the former would go straight into the terminal, while the latter would have to clear immigration and security before going to sit alongside their erstwhile seatmate whilst they both wait for their next flight.

Raff.ele,

Yes, sorry, I didn´t explain myself properly. When I said "coming from abroad" I meant into the UK, so if you are transferring into a domestic flight (landing in the UK, although not at LHR), you will ahve to go through immigration control.

At Dublin, arriving and departing passengers mix around the area of the 100 gates (formerly A pier) with signs directing arriving passengers through passport control and onto baggage reclaim. At all the other gates arriving and departing pax are segregated.

On the Schengen point, Ireland didn't sign up simply because the UK didn't. The thinking being that having to create a physical border on the island (between Ireland and Northern Ireland) was a) not acceptable and b) more bother than requiring citizens to carry a passport when travelling in the rest of the EU. It would also have removed the already existing free travel area between Ireland and the UK.

(with apologies to Adamm.'s earlier post which, now that I read it, already describes the situation at DUB :uhoh: )

JAS