Phone-shout-wanderers live in a world of their own. In the (comparatively) civilised location of an airline lounge - just point at them, and say very loudly 'you're shouting'. It almost always produces a positive result in this type of environment - inducing a bit of embarrassment making them SHUT UP. Fuming inwardly and giving hard stares achieves absolutely nothing. This strategy should not be employed in the 'outside world' but in an airport there's loads of security guards anyway...

Seriously - name and shame - it works a treat. The other is when you've held doors open for people who breeze through without acknowledgment: say very loudly 'oh, excuse me!' when they turn round say 'you're welcome' then turn and walk away. Again, very effective, and useful in the winter because you can usually toast marshmallows on their blushing faces