Originally Posted by Upgraded!

I'm not sure where the OP's passport is from, but for many this benefit will likely be moot. The majority of OW carriers (other than BA) use T3, where I believe there's an entirely separate FastTrack of sorts for those holding American, Australian, Canadian, Japanese and New Zealand passports. Since AA, JL and QF all arrive at, and make up a substantial portion of the traffic at, T3 there will be a fair number of people already subject to less scrutiny at immigration. I'd probably rather be on that line (even if it's travelers from all cabins/elite tiers) than on the "special line" right after a flight lands from a country where her majesty deems more scrutiny over those arriving.