China Southern Airlines has approved the Envirotainer Releye RLP temperature-controlled container for use on its aircraft. The RLP is a LD11-sized unit with air flow technology to maintain temperature stability and can take two US pallets or three Europallets. It fills a gap between the larger RAP-size and the smaller RKN-size allowing for increase efficiency by mixing and matching sizes. It has rechargeable batteries and can power its system for over 170 hours on a single charge.