Why AireOS in Wireless Class?

Why Kbits is still teaching AireOS in its upcoming CCIE class? Why it has not moved to IOS-XE based WLC 9800 controllers? How much effort is required to learn IOS-XE based WLC 9800 controllers if someone already knows AireOS based controllers?

We will be teaching both. There are WLC’s running AireOS and IOS-XE based. We will be covering both of them.