United Parcel Service, Inc. (UPS) is the world's largest package delivery company and a provider of supply chain management solutions. The global logistics company is headquartered in Sandy Springs, Georgia, which is part of the Greater Atlanta metropolitan area. UPS delivers more than 15 million packages a day to more than 6.1 million customers in more than 220 countries and territories around the world. UPS is known for its brown delivery trucks and uniforms, hence the company nickname "Brown". UPS also operates its own airline and air cargo delivery service (IATA: 5X, ICAO: UPS, Call sign: UPS) based in Louisville, Kentucky.