Some couples may have been married for years or decades and have earned a large number of rewards from various programs. If your spouse has a large amount of frequent flyer miles in his name, you may assume that those are his and cannot be divided in a divorce. That is not necessarily true, however. Almost everything can be divided in a divorce, including intangible assets such as frequent flyer miles. Some couples may have been married for decades and have earned a large number of rewards from various programs.
The first thing to do is to check the terms and conditions of the reward program. Some specifically state that the points earned are not transferable to a spouse in a divorce. While you may be able to get around that with a court order, it may be easier to simply calculate what the rewards are worth, and negotiate that value into your settlement.
In some cases, the company with the reward program will allow those rewards to be divided. In that case, you will simply divide the points equally into two separate accounts in your individual names. However, keep in mind there may be fees for transferring the rewards, and resetting the expiration dates of the rewards. You should come up with a plan for which party pays those fees.