Originally Posted by
Christopher
At Heathrow Terminal 5 everyone goes through the same channel. However, I believe that photo-ID is required of domestic travellers, not a passport, and domestic travellers aren't subjected to "immigration" checks (using "immigration" in the sense of checks by the immigration authorities). The point is that immigration checks for the departing passengers has been coalesced into one with security checks, but that doesn't mean that the two processes are the same.
Photo-ID isn't needed for a BA domestic - at least I've never been asked and anyway, I believe that the BA Exec card is proof of ID for BA. No photo-ID is needed to get through security, however if you are on a domestic flight, I believe that they take a photo of you at security and then check that at the gate to ensure you are still you.
Originally Posted by
Christopher
I have heard stories of some airlines (though not I think BA) seeming to require domestic travellers to present a passport as the acceptable proof of identity at check-in, although I don't know if that is true: in other words, would something like a photo driving licence be acceptable to those airlines?
As
jms_uk says, FR falls into this camp, however easyJet doesn't (per the STN example above). Their web-site clearly states that while passport or national ID card is needed for an international flight, it isn't for a domestic flight (though other photo ID is), and nor is for UK-ROI flights for British and Irish citizens.