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American Express and Avios just teamed up to make your Membership Rewards even more rewarding. As first reported by Frequent Miler, some cardholders are being targeted for a 40% or 50% bonus when transferring Membership Rewards points to British Airways Avios. Thanks to an improvement to the transfer ratio in 2017, this means you’ll get either 1,400 or 1,500 Avios for each increment of 1,000 Membership Rewards points you transfer. Usually, Membership Rewards points transfer at a 1:1 ratio to Avios.

Remember, you’ll need to be logged into your American Express account to check if you can utilize the deal, and unfortunately, it appears to be highly targeted, as no one in the TPG office had it on their Amex accounts.

If you’re targeted for a 50% bonus, this matches the highest transfer bonus that we’ve seen from Amex to British Airways, and it’s much more lucrative than Chase’s current offer (though that one is available to all travelers with Ultimate Rewards points).

British Airways Avios is one mileage program that some love to hate. And that’s understandable if you’re just looking at using Avios to fly transatlantic on British Airways flights. The BA fuel surcharges wreck the value for most rewards.

But by taking advantage of the distance-based sweet spots in the Avios redemption program, I’ve gotten more than 12 cents per Avios in value on Iberia premium economy flights, and often get more than 6 cents per Avios from short-haul intra-Europe flights. A TPG reader got almost 9 cents per Avios in value on American Airlines flights, while TPG’s Senior Points and Miles Contributor Richard Kerr has scored more than 10 cents of value for flights in the Caribbean.

There are also many ways to snag nonstop American-operated flights using Avios at lower rates than you’d pay through the AAdvantage program, and the program can also be a great option for short-haul flights from Oneworld hubs. And with an extra 40-50% Avios, now’s a great time to consider a transfer from Amex Membership Rewards, especially since the Avios should post instantly.

If you don’t currently have a card that earns American Express Membership Rewards points but don’t want to miss out on a transfer bonus like this in the future, there are a few great options currently available, each with hefty welcome bonuses:

Know before you go.

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