Called DL for flights in July (CLT->X->AMS->SVG and CPH-X-CLT return). I had KLM flights researched with Z fare space available--fully expecting nothing immediately available on DL. To my surprise was able to clear CLT-DTW-AMS-SVG and the return via JFK right at booking (all on DL metal, ex AMS-SVG of course). I am now 10 for 10 on GUC's...gotta say I am pretty pleased!