I'm not sure if there's any envelope expansion. On Feb 24th, they said it flew up to 15.403 feet. Now the tweet of TAI says it reached 15k feet. So it didn't fly any higher in the last two months. We haven't seen any aggressive manoeuvre or sharp turns or anything. And there's no supersonic flight yet..It depends on what they are doing in every flight, whether big chunks or small bits of envelope expansion is in question, production time being brought nearer says something.