Aerox Aviation Oxygen Systems of Limington, Maine, brought a range of its high-duration oxygen systems to NBAA 2014. Lloyd Boston, Aerox president, insists that oxygen isn't optional and that emergency backup oxygen is essential for safe flights above 10,000 feet msl. The company makes both fixed and portable systems, as well as emergency personal oxygen systems that are FAA approved. These include TSO-C103 continuous flow and TSO-C78A and TSO-C89A quick-donning, diluter-demand style systems, some of which can be used up to 40,000 feet msl.