Despite the powerful dimensional framework we just designed, we are unable to easily answer one of the most important questions about our frequent flyers, namely, where are they going? The segment grain masks the true nature of the trip. If we fetch all the segments of the airline voyage and sequence them by segment number, it is still nearly impossible to discern the trip start and end points. Most complete itineraries start and end at the same airport. If a lengthy stop were used as a criterion for a meaningful trip destination, it would require extensive and tricky processing whenever we tried to summarize a number of voyages by the meaningful stops.