For me, from just standing to watch the animals that are in the crates that are taken to the airplane and then loaded in.... I mean, even on the tarmac, there are other airplanes departing right beside them while they're sitting on the tarmac, and it's incredibly loud.
When we say that this happens to sport horses, we need to understand that sport horses have been handled; they have been trained. As a veterinarian, I know that when a horse comes to my clinic, a horse needs to be able to load and unload from a trailer. It's not my job to help the client load his horse. We assume that's all done.
These horses are not trained at all for the transport conditions. The noise level for us is incredibly loud. To me, the only way I can assess that from a distance with binoculars is by actually hearing the horses. For horses that are calm, you shouldn't hear anything in the crates. In this case, you hear kicking non-stop from one crate to the next crate to the next crate, and I feel sorry for the one horse that is sitting in there that's getting the kick as well. The incredible kicking that goes on in the crates tells me that these horses are not at peace and are not happy being there.