What are you searching for? Multi-city searches on delta.com require a stopover between segments for both revenue fares and awards. This would be 4 hours or more connections for US/Canada and 24 hours or more for most other international destinations. Although I just played around and it looks like multi-city award search doesn't work on international itins even with a stopover. Looks like only domestic/Canada is working right now for multi-city award searches.