Honestly, I wrestle with air travel – I've changed jobs and gone from flying a couple of times a month to a few times a year which has removed some of the guilt. That said, I am keen on travel, I've been a lot of places and there's plenty I've not been to, and selfishly I want to go, and realistically the only way to get to them is to fly. Plus I have a wife who's less negotiable on the issue, she's going and I'm going with her, husbands – she'll remind me – are a renewal resource. I would have hated not to have seen all the places I've been and lived, I have the one life, and come from a family that thinks seven miles is a once-a-year excursion.
On the counter, we don't really drive, don't have kids, hopefully make reasonable environment choices, etc.
Ultimately, we live privileged first-world lives, and that will always have an impact, however we divvy it up and justify it. Air travel seems to be totemic, but it's a modest cause of carbon emission (I know it's slated to grow) compared to most other sources. I think in part because it's easy to declare against (and make little exclusions for the annual holiday or to visit relatives, or because, well, you're a selfish sod like me).
We're, as this thread ought to tell, ultimately unwilling to give up the trappings of our lifestyle (and the developing world want the same lifestyle) and I'm not sure abstention ever works as a policy. That makes us very dependent on technological solutions and smaller societal nudges.
Of course, errant children are best kept chained in a basement or an attic. That way you don't have to worry about them moving abroad.