Hey guys- I've flown with my bike numerous times and have always let the air out of my tires as requested. However, once I forgot to, but when we landed, the tires were still full and nothing had gone pop. My question: someone just told me that the cargo hold is pressurized. So I was wondering if you guys know this is true for all planes? If so, why are we told to let the air out of the tires? I'd prefer not to this time around if I don't have to. Input please.