Here's an example. As I mentioned, the hold time today for rebooking assistance with Alaska Airlines is over nine hours. While call-back technology is readily available, #AlaskaAirlines is not offering call-back; you have to stay on hold the entire time. Causing failures to compound, modern cell phone systems are not designed for calls of that length and frequently drop before an agent is reached.
Here's the ugly secret. The Alaska Airlines MVP line, reserved for their frequent fliers, does offer call backs. I just got off the phone with them. The wait time was about six hours, but I was able to do something else in the interim and I was not driven insane by their corporate theme music.