Activating your Aviator Mastercard online is quick and easy. Follow the required verification steps, enter your card details and complete the process to start using your new card.
Activate Aviator Mastercard Online: Getting a new Aviator Mastercard is only the first part. After your card arrives, you need to activate it before you can start using it for purchases. Aviator cards have been connected with American Airlines AAdvantage and are issued by Barclays Bank Delaware. However, there is an important 2026 update. American Airlines has announced that its Barclays co-branded card portfolio is moving to Citi during 2026. Existing cardholders are expected to receive more information as their accounts move through the transition.
Because of this change, the activation method can depend on when and how your card was issued. The instructions that come with your new card should always be followed first.
Older Aviator instructions used aviatormastercard.com/activate and the “Activate my card now” option. Since the American Airlines card program is moving from Barclays to Citi in 2026, use the website provided with your new card for the most accurate instructions.
The older Barclays number for Aviator card activation was 1-877-408-8866. Because the American Airlines card program is moving from Barclays to Citi in 2026, check the number on the back of your card or in the welcome letter before calling.
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