When a city is connected to your Capital, you get the little City Connection icon under the City Name. That's cute, and is informative. Even on foreign shores, as long as you're connected with a Harbor, you get the City Connection icon. But what about being connected with an Airport? Wouldn't it be useful to have a similar (but different) icon showing that your city is connected to the Capital with an Airport? I remember there was such an icon in Civ III. It would help to see in a moment that, 'Ah-ha! So-an-so City has an Airport! I can airlift a unit there!' It would also help if you built a City inland on a foreign shore, where it isn't possible to build a Harbor (resource chasing). Why should an Airport not have the same City Connection recognition as a Harbor? Just a thought.