The iPad Air 4 ships with a 20W USB-C charger vs. the iPad Pro's 18W charger
Amazon.com: ipad air 2 charger
12w charger for iPad Air, iPad Air 2, iPad Mini or any iPhone model that uses the lightning cable
About Apple USB power adapters - Apple Support
2x 10W USB Power Adapter Wall Charger for Apple iPad 2 3 4 Air 1 2 Mini 1/2/3/4 | eBay
Official Apple iPad mini 6 2021 6th Gen USB-C To USB-A Adapter -White
iPad Air (4th generation) - Power & Cables - iPad Accessories - Apple
Qi Certified Fast Charge Wireless Charger for Apple iPad Air (2019); 10W Wireless Charging Pad Compatible with iPhone XR/X/XS/ XS Max; Apple iPad Mini (2019); Apple iPad Air (2019) - Walmart.com