Examples disclosed herein relate, among other things, to a controller communicatively coupled to a plurality of radios, where each radio may be associated with a wireless channel. The controller may obtain, for each radio in the plurality of radios, a set of parameters associated with the radio's communication through the wireless channel associated with the radio, and determine an air-time capacity of the radio based on the set of parameters. The controller may also calculate a combined air-time capacity of the plurality of radios based on the air-time capacity of each of the plurality of radios, and based on the combined air-time capacity, determine whether to assign a different wireless channel to at least one of the plurality of radios.