Atlas Air Worldwide Holdings, Inc. is the parent company of Atlas Air, Inc. and of Polar Air Cargo, Inc. Atlas Air offers its customers a complete line of freighter services, specializing in ACMI (Aircraft, Crew, Maintenance, and Insurance) contracts, utilizing its fleet of B747 aircraft. Polar's fleet of Boeing 747 freighter aircraft specializes in time-definite, cost-effective, airport-to-airport scheduled airfreight service.