China Aircraft Leasing Group (CALC) (1848.HKG) has signed a provisional deal with Airbus Group NV (AIR.EPA) to buy 100 planes, Reuters reported, citing a stock exchange filing by the former. The deal, worth US$10.2 billion, adds to CALC’s fleet as it and other Chinese leasing companies increasingly focus on medium-haul aircraft designed to serve the country’s domestic routes. Despite China’s ongoing slowdown it remains the world’s fastest-growing aviation market, and is set to surpass the US as the busiest domestic air travel market within 10 years, according to recent Airbus forecasts.