Most air miles credit cards will reward you with points or miles. However, the value of the points or reward miles you earn can change every time you book a trip. You can easily determine how much your points and miles are worth for redemption. Just divide the total price of your purchase by the total number of miles or points. Let’s say you decide to use 50,000 miles on an airline ticket that costs $1,000. In this case, your miles are each worth 2 cents. Airlines understand that travel plans can change at any moment. Therefore, most of them will allow you to modify a flight you booked with miles or points. Some may even do so without charging you. This is a huge perk if you’re particularly prone to last-minute flight changes. You may be able to make changes to your flights without spending a lot of time or extra money. While each airline has its own set of rules, you’ll find that the flights you book with miles often offer flexibility. It may be overwhelming to keep track of all your miles or points if you open and use more than one air miles credit card. One of the best ways to stay organized and track your rewards is through a simple Excel or Google spreadsheet.