Charging iPad Air 4th gen
Is it safe to charge the iPad Air 4th gen with a 61 W USB-C power adapter from a MacBook Pro?
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Yes, or even a larger one. See the following from Charge your iPhone with an iPad or Mac notebook power adapter - Apple Support
You can use Apple USB power adapters for iPad and Mac notebooks to charge iPhone, iPod, Apple Watch, AirPods, and other Apple products.