I never received any notification, but despite the misleading messaging, Boingo is no longer offering in-flight Wi-Fi with airlines. They explained that this decision was made solely by Mastercard.

As a result, your existing Boingo account, which was tied to the perk offered by your credit card, has been cancelled. Boingo now requires current users to sign up again and pay a subscription fee. However, there is no mention of in-flight Wi-Fi; instead, the focus is on Wi-Fi hotspots [[url]https://www.boingo.com/for-travel/].

When I reached out to Boingo, they confirmed that they no longer provide in-flight Wi-Fi. Users must purchase the service directly with the airline.