The airline industry involves transporting passengers and freight by air on scheduled routes, typically using airplanes. Quality is important in the airline industry because air travel is often the only viable option for long-distance travel, and passengers cannot choose safer alternatives. There are several quality rating systems that airlines implement, including the World Airline Star Rating, SKYTRAX Airline Quality Audit, and IATA Operational Safety Audit, which evaluate hundreds of areas of product and service delivery across airlines. Maintaining high quality standards is a driving force in the industry, as seen in the case study of Singapore Airlines, which has a 2-star rating and focuses on customer feedback, service development, and benchmarking against competitors to deliver excellent service.