If something can be transferred after death, then you should make it a part of your estate plan.
That is the best way to make sure that the assets go to the person or persons you want them to.
However, because loyalty programs are usually only transferrable based on the grace of the company, your estate plan should probably not rely on them for balance. In other words, it might not be a great idea to give one person less money because you are leaving them your frequent flier miles.
If the company refuses to transfer the miles, that could lead to problems.
If you have questions about making loyalty programs a part of your estate plan, visit with an experienced estate planning attorney.