Each airline has its own rules concerning unaccompanied minors, but airlines generally do not use parental consent forms. Instead, airlines typically require an additional service charge, child identification information, and contact information for guardians at the child's departure and arrival airports.
Though parental consent forms are not required, the child's guardian must fill out identification forms for the child, the guardian himself and additional approved guardians at the arrival airport. Guardians must contact the airlines immediately about any changes. Virtually all airlines, including Hawaiian Airlines and Alaska Air, do not release children to adults who lack the appropriate paperwork.
Unaccompanied minor service must be booked in advance. Fees for the service vary by airline and generally cost between $50 and $150 each way. Alaska Airlines and Hawaiian Airlines have fees on the lower end of the spectrum, while United Airlines and American Airways charge fees on the upper end of the spectrum.