The document discusses airline budgeting. It explains that a budget is a written plan of estimated future income and expenses over a period. For airlines, budgets differ slightly from other industries as numbers are statistics, percentages, and available resources. The document focuses on two major budgeting types - zero-based budgeting and activity-based cost analysis. Zero-based budgeting requires justification of all expenditures rather than just increases from the previous year. Activity-based cost analysis identifies the costs of individual activities and cost objects. The document provides advice on effective airline budgeting practices.