Fedora 27 Macbook Air (Mid 2013) live usb-stick no wifi

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Hi,

I'm new to Linux. I try to run Fedora 27 on a Macbook Air (Mid 2013). The systems boots fine into the GUI, but there I have no wifi. There is no option to activate it. I think I have to install a wifi driver, but how without wifi - there is no RJ45 interface (LAN) on the Macbook Air. And what is the correct driver and where to find?

Thanks and regards, Da