I travelled to Nepal in China Eastern Airlines last year. it is a normal airlines just like any other airlines. Transit visa is not required if the total transit time is less than 24 hours. But you do have to go through Chinese immigration process such as passport stamp in and stamp out, filling and submitting immigration cards etc. You will need to claim the baggage in Transit and then check in again. The transit times are longer than other airlines, but considering low cost, it was worth it for me. I am already planning my second trip in China Eastern Airlines. I have no complaints.