What carrier does bike flights use?

I'm curious about the logistics behind bike flights. Could you please clarify what carrier they use to transport bicycles? I'm interested in understanding the transportation process in more detail, including any special arrangements or precautions they take to ensure the safety of the bikes during transit. Additionally, do they have partnerships with specific airlines or do they use a variety of carriers depending on the destination? It would be great to get a clearer picture of how bike flights handles the shipping aspect of their service.