<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Non-chronological itineraries can indicate possible duplication between two one way segments even if the segments are in different city pairs. For example, if one itinerary shows a one way Tucson-Chicago flight on the 15th and another PNR shows a Tucson-Seattle one way flight on the 16th for the same passenger, these records would be flagged as potential duplicates. Mirrored itineraries would show the potential for back-to-back ticketing. For example, a Saturday night stay on a Tucson-Seattle-Tucson leaving on Tuesday and a Saturday night stay on a Seattle-Tucson Seattle leaving on Wednesday, would be identified as a possible back to back.</font>