Some of the main drivers of supply in the airline industry are technological innovation, economies of scale, and differentiation. Technological innovation allows airlines to reduce costs, improve efficiency, and enhance customer experience. For example, new aircraft models, such as the Boeing 787 or the Airbus A350, are more fuel-efficient, spacious, and comfortable than older models. Economies of scale refer to the cost advantages that airlines can achieve by increasing their output and spreading their fixed costs over more units. For example, larger airlines can negotiate better deals with suppliers, airports, and customers, and can offer more frequent and diverse flights. Differentiation refers to the ability of airlines to distinguish themselves from their competitors by offering unique or superior products or services. For example, some airlines may offer premium services, such as lounge access, priority boarding, or in-flight entertainment, while others may offer low-cost services, such as no-frills flights, online check-in, or baggage fees.