Used for parts, just as QF cannibalised end of life aircraft including their 747 and 380 for parts.
ZL has probably the world's largest inventory of SAAB340 parts.
Back in 2013 ZL purchased from another large US Saab340 operator their entire spare parts inventory. The press release mentioned that their inventory would assure another 15 years operation from 2013. That would be 2028.
Can't fly any aircraft without available spare parts and no doubt they have been keeping an eye out for airframes and parts over the years.
Dont forget NZ, Canada. They will get them wherever they can.