That's the mainland Chinese airlines, despite the name China Airlines they are actually based in Taiwan and their hub is Taipei, which is a completely separate democratic country, and western backed. Apparently the country broke away from mainland China in the 1940's and China refuses to accept them as a separate country. Taiwan is apparently also know at the Republic of China and as opposed to Mainland China which is known officially as the People's Republic of China. Taiwan - Wikipedia (highfive) Enough about Geo-Politics!
Unfortunately deluxe budget is already a thing. Virgin introduced new classes of Economy this year - Light (no luggage), Classic, and Delight (extra legroom), and that is before Premium Economy!
out of curiosity..... Why your next flight may go via China :- https://www.bbc.co.uk/news/business-45168924
The flight is around 12.5-13 hours on the London to Taipei sector, with 4 hour stopover and around 8 hours on the Taipei to Sydney sector... Economy seats are 32 inch seat pitch and 18 inches wide. BA by comparison is around a 30 inch seat pitch and 17-17.5 inch wide seats, but might be slight variations depending on aircraft type. (Don't ask me why its quoted in inches.) Not sure how cheap China Airlines economy flights are. With China Airlines, once you have received your e-ticket from Travel Pack, you can go to the airlines website and immediately choose your seats for free, and allows you to view all flights, choose meal options if have a dietary requirement and add frequent flyer details if a member of a SkyTeam airline program. (Well this is the case for Premium Economy, so guess the same for Economy too?!)
You are correct, there are 31 seats! I will immediately update the post. Below is an image of the seating plan of Premium Economy in blue and a link to China Airlines website with full details of the aircrafts seating plan. China Airlines - A350-900 Seat Map. The seats in Premium Economy/Deluxe Budget/Oxymoron class, are a hard back shell seat, which means the seats in front do not recline into your space. You slide the seat forward and it will recline. The seats are 20 inches wide, 39 inch pitch and offer 129 degree recline.