I don't know the reason but there are some A321s done at TLS rather than XFW. It's not just a case of A320s at TLS and A321s at XFW. The way the order backlog is these days, the A321 is very much the type that needs extra capacity. They're even assembling European-bound aircraft in Tianjin now. I wonder when the first BA aircraft is going to be done there...

In other news - TTSC started ground tests today.

edited to add-
TTSB has also had its engine run and taxi test today.