I will be happy when the switch to Delta is complete. When planning flexible date itineraries try to find the best price and departure times, the prices displayed are often different than those given when searching those particular dates. Often there are flight choices priced less than originally displayed, and sometime flight displayed from the multi-day selection grid that do not appear on the single day offerings. These are always flights coded by DL on NW metal or multi-segments flights on both airline metal. Finding the best option will be much easier when all are one.