I'm planning to fly within the USA tomorrow and am a little worried. Does anyone have experience with the latest security restrictions while wearing a locked, heavy, metal collar? I called the airline and asked if I should expect any problems, describing it as a metal choker collar of sorts and was told not to expect much, but I'm still a bit worried. I'll have a key to take with me but I don't want to take it off at all! Experiences and advice would be appreciated.