Discussion continued here to avoid derailing original thread:
	
		
	
	
		
		
			lot about the new semi-stealth trainer, saying that it has good supersonic combat capabilities and enables full BVR tactics in training and also will be used as export. Currently BVR training is mostly done on J10S and J11B since old trainers doesn't fly fast enough to enable many tactics.
		
		
	 
Then hopefully, China's future trainer aircraft fleet could be consolidated to streamline production, procurement and operation.
Namely, starting with CJ-6 or TA-20 as the basic trainer, followed by a common platform as the intermediate trainer (replacing the JL-8) before proceeding with the JL-XX as the advanced trainer (LIFT) to succeed the JL-10. The JL-XX would perfectly bridge the path between the less-advanced trainers and the advanced 5th-gen and 6th-gen fighters.
As for the issues regarding single-engine fighters:
- There is only the J-10 family in the entire PLAAF and PLANAF which are both single-engine-powered manned fighters AND expected to have a meaningful, sizeable presence in the PLAAF for the foreseeable future;
- All the present and upcoming manned fighter jet (programs) across the PLAAF and PLANAF will have at least two engines; and
- As for possibility of the S/VTOL fighter aircrafts in the future - As of present, there has been zero public confirmation of such aircrafts being seriously considered by the PLA beyond academic studies and technological verification projects.
Besides, if there are indeed S/VTOL manned fighter plans for the PLANAF of the future - There's the JL-9. Despite this, remember that the JL-9 is of a rather conservative/less-advanced design (meant as a safe fallback in case the JL-10 program fails), being powered by a WP-13/14 turbojet, and with its lineage dating back to the JJ-7 (and the J-7 family in-overall). It's not exactly old and worn, but not exactly new and state-of-the-art either.
Therefore, it could be better to let the JL-9 to fill up the intermediate trainer category, whether in its current form, in its upgraded form (such as swapping the turbojet engine with a new turbofan engine, with new avionics, computer and flight control systems installed, etc), or have a clean-sheet successor to do the job.
In fact, either of the latter two options is a good opportunity to make such trainer aircrafts become more competitive on the export markets too, alongside the added benefits of maintaining Guizhou's designers and engineers' wealth of skillsets (similar in a way to Hongdu with their JL-XX).
In the meantime, it's really time to let the J-7 family (and especially the JJ-7s) have their well-deserved rest...