Can children fly without an adult

Should be no different from any other airport. Look at laws. Claim it is anyone under 18 needs approval and/or someone to drop off, pick up, etc.

Yes, but different policies and prices by airline.

You must check with your airline to determine if a child of a certain age can fly without an adult, since the airlines govern the policies around this.

Yes

Yes, contact the airline to discuss arrangements

Talk to your specific airline for laws and regulations plus their policies.

Talk to the airline they have that service