revision preference src: Thirty-eight of 160 plus China Southern domestic routes will compete with the rail line. The China Southern has aggressively cut fares, slashing the advance purchase price of flights between Wuhan and Guangzhou by almost half. <SEP> tgt: Thirty-eight of 160 plus China Southern domestic routes will compete with the rail line. The airline has aggressively cut fares, slashing the advance purchase price of flights between Wuhan and Guangzhou by almost half.