May is a month for major deals if you're a member of the American Airlines AAdvantage frequent flyer program. Members have some incredible opportunities to fill their accounts with bonus miles without even flying. The airline is giving customers a chance to get a bonus of up to 40 percent when they purchase AAdvantage miles from now until May 31. This promotion makes it possible to get your hands on valuable miles for pennies.

The actual monetary value of miles varies depending on how many you purchase. Purchasing more miles will allow you to get each mile at a lower cost than if you purchased a smaller amount. You may already know that the regular member price for buying miles from American Airlines is 3.17 cents per mile. This offer actually brings the cost per mile down to just 1.92 cents if you purchase the maximum amount of miles allowed. This offer could help you get all of the bonus miles you'll need for the rest of the year without putting any more energy into chasing down deals.

A Closer Look At American Airlines' Big Summer Miles Promotion

A bonus of 40 percent is the maximum you can get when you purchase miles during this promotion window. It will take purchasing 150,000 miles to receive that bonus amount. American Airlines is still offering some pretty impressive opportunities to customers who purchase fewer miles. This means you can dig in and enjoy a great deal even if you've already purchased some miles this year using other promotions. Here's a look at what you can expect to earn at every tier:

  • 10 percent off when you purchase between 11,000 and 25,000 miles
  • 20 percent off when you purchase between 26,000 and 50,000 miles
  • 30 percent off when you purchase between 51,000 and 100,000 miles
  • 35 percent off when you purchase between 101,000 and 149,000 miles
  • 40 percent off when you purchase 150,000 miles

How To Get In On The Deal?

Earning bonus miles for your AAdvantage account without actually flying is pretty simple. Members will need to visit the American Airlines website for buying, gifting and sharing miles. All it takes after that is selecting the amount of miles you wish to purchase and entering your account details and payment information. Miles should post to your account instantly.

One thing to note about this promotion is that members aren't able to share their bonus miles. In addition, all of the usual restrictions regarding the maximum amount of miles a member can purchase per year are in effect.

This deal is good enough that you may want to consider purchasing the annual maximum of 150,000 miles if you have a big trip planned for the summer. Also, bear in mind that this will be your last chance to purchase Aadvantage miles using a deal this year if you do choose to buy the full 150,000 miles that are on the table in this offer.

If you have the credit card shown below, be sure to use it when you are purchasing Aadvantage miles - you get to earn extra AAdvantage miles with each $1 you spend buying AAdvantage miles!