While you personally cannot take them to the grave, you may be able to get one last set of miles if your casket is shipped on AA and you are listed as a passenger (tho seating will be in a reclining position in cargo which may be under First class).

Your miles at least on AA are accepted as part of your estate and can be transferred to an heir or other designate per the will (per the AAdvantage Terms and Conditions this is not a guarantee but is currently common practice at AA tho may change on a case by case basis). And these transferred miles count into the Lifetime miles or the recipient.

And NO to the OP . you can be part of my will.