Originally Posted by
ExXB
Er, no. I don't think any redesign is needed to allow arriving passengers to walk up the existing jetway into the terminal - the opposite of what departing passengers do from the gate. You perhaps might need 1 staff person to stand at the junction of the two paths (one to immigration, the other into the terminal) to herd passengers in the right direction, but the reduction in numbers that need not be security screened would offset this 10 times over.
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.