Hipmunk has a great interface but is totally unusable for one reason: they don't list all flights. This may have changed since the last time I checked (within

Hipmunk has a great interface but is totally unusable for one reason: they don't list all flights. This may have changed since the last time I checked (within the past year), but Kayak would list many more flights than Hipmunk would. Until they have data for ALL flights, what's the point? Kayak is pretty awesome. The one feature I'd like them to add is a filter for flight duration. I can -sort- by duration, but I can't tell it to just ignore 15+ hour journeys when it's showing me ~8 hour journeys.