Traveling with a cat in cargo- how worried should I be?

I will be moving back to America and I’m taking my boys with me. Unfortunately, one has to go on the cargo and I’m thinking it’ll have to be my younger boy because my other one is older and very timid. I feel extremely guilty about putting my cat in cargo— all I think about is if it’s going to be loud, cold, what if they forget to pressurize? Etc. honestly mentally all I can think of is worse case scenarios and I’m stressed, I wish I could have them both in cabin with me. Rehoming is not an option as these guys are my life and bonded. If anybody tells me it’s cruel to have one in cargo, trust me I’m already feeling like the worst person for it. Thank you in advance.