Prior to Project Mother at the start of COVID, Rex signed an MOU with ATR for replacement of the Saab fleet on a 2:1 basis. The MOU also included a sim centre in Sydney with ATR sourcing buyers for the Saabs they were taking from Rex. Needless to say Rex walked away from the MOU once the 73 was tabled and left ATR hanging. I suspect ATR will not welcome them back with open arms considering the order book is full for some time and most second life machines are spoken for.
If that's the case then the framework for a new partnership with new owners might be possible. There's also the new Dornier which should come to market in the next few years, Rex should have been the launch customer for that, just like Kendell led the way with the SAAB purchases. But focus is everything.