I've been looking for a website similar to travelocity, expedia, cheapflights, etc that in addition to searching fares with various airlines on a particular itinerary, will also enable me to specify the cabin class for each sector (i.e. sector 1: Business, sector 2: First, etc) on a multi-city option. Several years ago there used to be a site called itn if I'm not mistaken where one can perform those options. But that has long been gone and I haven't really found anything similar since then. Does anyone know if something similar still exist that I can easily access online without having to contact a TA to perform those in their GDS?