When trying Elementary OS 5.1 on a 2013 MacBook Air 13 (6,2) from a USB stick, everything seems to work, except for WiFi. The WiFi hardware does not show up at all.
There is a very similar question already, and it has an answer, but for a different version of Elementary OS (5.0). That solution removes the
bcmwl-kernel-source package and installs
firmware-b43-installer, but 5.1 does not include