As the expenses are related to the operation of the business of direct flight or operation of air, oil and fuel, employee salaries, maintenance, depreciation of equipment. The facilities of aircraft, etc.
The charges are related to the operation of the business of direct flights or operation of the aircraft, oil and fuel, salaries of employees. Maintenance Depreciation of equipment Facilities of planes and so on.
As the cost is related to the operation of aviation business directly or operations of the air, oil and fuel,The salary of the staff, maintenance, depreciation of equipment, facilities of the plane.