In February 2011, the airline painted eight of its aircraft with a lightweight, thin "revolutionary nano technology coating" polymer. It works by reducing the build-up of debris and reduces drag across the surface of the aircraft, thus reducing the fuel bill. It was estimated the airline could save 1–2% annually, equating to a £14 million reduction in fuel costs. The coating has already been used on US military aircraft and if successful EasyJet would apply the paint to its whole fleet. In late 2015, EasyJet started making use of artificial intelligence (AI) and big data for the purpose of improving efficiency, cutting costs, and enhancing the customer experience.