Delta Reserve companion cert exp 11/30 (fly by) $170 obo. This is good for first class, confort+ and expended economy booking class. Best use is to book transcontinental first class but it also gives you better econonmy availability than the one from platinum.
Available booking class: I,Z,P,A,G,W,S,L,U,T,X,V
Fully transferable but only the primary flyer earns MQM and miles.