Index: src/client/cl_market.c
===================================================================
--- src/client/cl_market.c      (Revision 9513)
+++ src/client/cl_market.c      (Arbeitskopie)
@@ -345,6 +345,8 @@
                        return;
                }
                for (i = 0, j = 0, air_samp = aircraft_samples; i < numAircraft_samples; i++, air_samp++) {
+                       if (air_samp->type == AIRCRAFT_UFO)
+                               continue;
                        tech = RS_GetTechByProvided(air_samp->id);
                        assert(tech);
                        if (RS_Collected_(tech) || RS_IsResearched_ptr(tech)) {