Yes, the 2015 MacBook Air supports 4K displays at 60Hz | Ars Technica
Apple MacBook Pro Retina 15 (Mid 2015) Review - NotebookCheck.net Reviews
Amazon.com: Satechi Aluminum Type-C HDMI Adapter 4K (60Hz) - Compatible with 2022 MacBook Pro M2, 2021 MacBook Pro M1, 2020 MacBook Air/Pro M1, 2022 iPad Air M1, 2021 iPad Pro M1 (Silver) : Electronics
UGREEN Mini DisplayPort to HDMI DVI VGA Adapter 4K Mini DP Converter Thunderbolt Compatible 3 in
Driving a 4K Monitor at 60Hz from the 2015 13″ MacBook Pro – Around the Hill
MacBook Pro (Retina, 15-inch, Mid 2015) - Technical Specifications
MacBook Air 11in (2015) review | Stuff
When 4K Isn't Enough Anymore
YIWENTEC usb c hub thunderbolt 3 dock station usb3.1 type-c to hdmi 4k cable Adapter For macbook pro 2017 2016 2015 12" DELL XPS ASUS D0406-Multiport USB C TO HDMI DVI VGA-YIWENTEC
LG UltraFine 4K Display - Apple
Can I run two 4k (3840x2160) displays at 60hz on a Macbook Pro 13" 2015 - Ask Different