You gain access to the Capital One Spark Business Rewards program by being a card member of certain Capital One Spark credit cards such as the Capital One Spark Miles Business Card and the Capital One Spark Miles Select Business Card. In the program, you can EARN Capital One Spark miles. You can then USE these miles for free travel.
Read about how to earn and accumulate Capital One Spark Miles here
Read about how to use Capital One Spark Miles here
Read about sharing and transferring Capital One Spark Miles
Read About Capital One Spark Miles expiration Information
Read about what happens to your Capital One Spark Miles upon death