Katara held Aang DEAD in her arms. She already lost him once. She’d be insane not to be worried about a repeat days before he goes to face the most powerful bender on the planet to decide the fate of the world.

Then how come there were no hints about that? No longing glances after Aang, no 'kiss, kiss, wait, we can't do that!' Katara just jerks away and looks pissed. I have seen no hints since 'The Headband' that she likes Aang In That Way and if Mike and Bryan want to end the series with that romance (which they might not, at this point, and I would be thrilled and impressed) they should be giving us clues that the female lead IS crushing on the male, even if he doesn't know.