The term "Double Miles" refers to a promotion or offer from an airline, hotel loyalty program, or credit card company that allows customers to earn double the usual number of rewards points, miles, or credits for their purchases or activities. This can be used as an incentive to encourage people to use specific products or services more frequently, or to try out a new brand. For example, if you normally earn one mile for every dollar spent on your credit card, with the "Double Miles" promotion, you would earn two miles per dollar instead. This can be a great way to quickly accumulate rewards points and take advantage of special deals or discounts offered by these companies.