Hi, I had asked Jon and GaryGB a question regarding this problem that I have since they had a thread that mentioned SPJJ back in 2011. I also thought I might have dealt with it a couple of years ago in a thread, but cannot find anything related. OK, here is the problem, I have started working on Jauja, Peru, SPJJ, and ran into an elevation problem pictured below. The default FSX airport has an elevation anomaly, so using ADE I first changed the airport elevation using tools / change airport reference data, then did a flatten. However, the anomaly is still there. Jon had asked me to check for a SPJJ_ADEX_BG_ALT.bgl in scenery/world/scenery. It is there Jon. Any help mightly appreciated as always. Bernardo.