As a general rule, children should travel with an adult. Check with your company to see if they have a chaperone service (a member of the cabin crew who, after paying the company for their services, can take care of the minor).
If the child is five or over they can travel alone, provided that the person responsible for the minor signs a Waiver of Responsibility and guarantees that an identified adult will take charge of the child in the arrival airport.
If you are travelling with babies or young children, most companies have an activities service –books, games, etc.- and, if you request them in advance, children’s meals.
