Delta has an acceptable sale from Dallas to Sao Paulo which is sold as LATAM codeshares increasing the MQDs earned on this fares. It is possible to fly entirely on Delta metal via Atlanta or New York. This example is via JFK both ways which adds into the flying time but adds more MQDs.
DFW-GRU would earn 18408 MQMs 3682 MQDs 1.55 MQD Ratio while Delta Diamond members would obtain 33134 RDMs, Platinum 28226 RDMs, Gold 25771 RDMs, Silver 23317 RDMs, Base 18408 RDMs
Delta Boeing 767 Business Class