Niki (Austria) ended A320 operations, following the transfer of it's last example to sister airline Air Berlin (mostly for wet-lease to Eurowings). The majority of Air Berlin's A321s have transferred to Niki, which now operates 16 of the type.
Postscript: Following Air Berlin's 8/17 insolvency filing, Niki Lauda is bidding to buy back the airline he created and owned.
