Maintaining the integrity of temperature-sensitive products, especially pharmaceuticals, during distribution requires refrigerated warehouses and trucks. Extending the cold chain to air adds another layer of complexity. Envirotainer was one of the early companies that years ago began providing insulated containers with cooling properties. Since then the technology has evolved. Envirotainer's Donald Harrison joins Air Cargo Editor Eric Kulisch to discuss the latest advances in refrigeration of air cargo containers and tracking in-transit temperature deviations, the COVID vaccines distribution and the logistics of leasing and repositioning containers around the world.