I would never dream of asking the nature of the call - but enough to say that you have piqued my curiosity

We do not know whence you are are travelling but if it should involve . a B-Gate I would head over there - there are also very deserted areas over there. I would also think that the toilets anywhere in the FLounge would be ideal. I doubt whether anyone would be listening at the door. What I have found is that most people do not have a clue what you are talking about, confidentiality can cover a multitude of areas. As has been pointed out, the majority of people have other things on their mind than concerning themselves with someone on a phone. You do not mention whether this is a video call or a normal up to the ear one. That area of the FLounge which looks like a Tea dance palm court room provides areas where if you are not speaking loudlyu you can be comparatively secluded. It will be interesting to learn where you did place/take the call ultimately.