What type of costs is included in aircraft-related costs?

Aircraft-related costs are specifically associated with the operation and maintenance of an aircraft. Fuel and airport taxes are crucial components of these costs as they directly impact the aircraft's operational efficiency and overall expenditure. Fuel is necessary for flight operations, and its price can significantly affect the total cost of operating an aircraft. Airport taxes, on the other hand, are fees imposed by airports for the use of their facilities, which also contribute directly to the operational costs incurred during flight operations.

In contrast, employee bonuses, advertising expenses, and office supplies do not pertain directly to the operational costs of an aircraft. Employee bonuses fall under payroll and personnel management costs, advertising expenses relate to marketing efforts, and office supplies are associated with administrative functions rather than the specific costs tied to aircraft operation. Hence, while they are important expenses for an organization, they do not qualify as aircraft-related costs.