Originally Posted by
Swiss Tony
But you can't just hang out by the gate in Dublin - you have go go through immigration & back through security, right? They could turn the plane in 25 mins, with boarding pax lined up ready to board in the event of a delay.
Anyway, I wouldn't do it.
Yes but going through immigration and security at DUB with access to fast track thanks to the J redemption (even if the OP is not SCH/GCH) is not quite like going through immigration and security at LHR T5 connection or at Pyongyang Sunan International Airport.
Sure: the risk is not zero but it is
very small.
and can't for the life of me understand why anyone would want to tackle this route this way, especially on a redemption, when they could just go straight to the US from Dublin with the bonus of pre-clearance.
Actually, it would be much riskier to do a LON-DUB on a revenue ticket and then a separate (redemption) ticket direct to the US from DUB on AA or US: the risk of a misconnect is much higher in this hypothesis unless you stay overnight in DUB. In this latter case, your risk of misconnect is lower but not nil either: what if there is an issue in the evening at LHR resulting in all remaining LON-DUB being cancelled for the day? Admittedly, the odds are rather low but they are still higher than not making it on a back-to-back at DUB.