Yes you can, and from what observed they get first boarding privileges and they do there best to assure they are taken care of before the gaggle of people roll on board...
Yes
Yes, but as a previous person responded, please check with the airline. I know at that age there are some things are needed.
Yes no worries
Yesss
Yes, you need to check on their website on how to do it
Yep
Yes. You can find more info on the website
There's a section on the website for unaccompanied minors. You should read it, but the answer is yes
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