In front of Monument Mountain High School. Above the flag, lettering appears to read, "GJR SKIING IN THE CLOUDS!"
http://www.redcrownews.com/2011/09/tribute-911-victims-recreated-monument-mountain/
http://www.legacy.com/obituaries/berkshire/obituary.aspx?n=calum-rintoul&pid=152824963
http://www.berkshireeagle.com/local/ci_19998025