A couple good fares on AeroMexico to Cancun with wide availability, from August to end of year, no min stay.
Sure thing, it's a 737, don't expect much from the metal. It's a MR.
$648 roundtrip
5780 flown miles
8670 MQM on Delta (150%)
(SkyMiles between 8670 and 19074 depending on status)
7.5cpm
1734 MQD (which makes it useful for those not committing to 25k waiver)
Sample date: Nov 11
https://goo.gl/flights/Wdmw