Maybe iI am not creative enoiugh, but I don't see how tripit would work for multiple travelers for the same meeting - it is great for one traveler to multiple meetings but I can't see how it can be adapted for meetings.

I think an old fashioned spread sheets like Excel (I know how mundane that sounds) but that is what I have used, and you can enter the data and then rearrange arrange it in multiple ways - by arrival times, airlines, departure times, length of stay, whatever parameter you choose.