The bad point is RMB升值 will make the export of China drop. RMB becomes more expensive in terms of USD. US will import less goods from China, which will affect the export of China. Some firms may earn less. Trade deficit will become less for USA.
航空 firm will benefit from it. They borrow a lot of money interms of USD. If RMB 升值, they can use less amount of RMB to pay the same amount of USD.