Yes, it’s a physical fact, and Miami goes through the most dramatic change coming from sea level.Is it that big of a deal? I thought it was, though I can't recall any personal references. I don't think I've ever been in high altitude. Okay, I went to CO when my grandmother died a while ago, but I didn't have to perform at a professional athlete's level. I'm leaning toward the thin air being an issue. That should be on the FO though. They should have flown out a day early.