pu1. It's hard to say when tickets are cheap unless you buy them early bird
2018-05-11
pu2. China Airlines or Russian Airlines are cheaper. It's hard to know the date because it's a real kebaker.
2018-05-11
pu3. I think I heard that the average date was 5 months ago or the cheapest, but that's not exactly right either Pin Air is cheaper and more comfortable