5 aircraft and 5 cabin layouts, from the A320 to the 787-9. Pick one for its seat map, the best seats and the seats to avoid.
There are seat maps for 5 Juneyao Air aircraft here: the Airbus A320, the Airbus A320neo, the Airbus A321, the Airbus A321neo and the Boeing 787-9.
The Boeing 787-9, with 324 seats: 29 Business and 295 World Traveller in its main layout.
The Boeing 787-9, with 31" to 32" of seat pitch in Economy and seats 17.1" wide.