Unfortunately that's no longer correct...
Both OLT companies (OLT Express Poland and OLT Express Regional) have gone bankrupt, all aircraft were returned to lessors except of 1 or 2 which were arrested by airports to secure payments.
Long story short: A (suspected) pyramid-style financial company AmberGold (para-banking, not supervised by Polish Financial Supervision Authority as it had no banking-licence) purchased struggling OLT company and tried to build a low-cost regional airline, flying olny local routes with A319/320 with 50% of seats in 99 PLN fare (~25 EUR, taxes included). For such price they had provided full catering and all advantages of Full-price airlines. Moreover they spent on Marketing more than most of FMCG companies.
When PFSA started to take a closer look into AmberGold and started warning actions to the customers and bank market, OLT was cut-off from the wide stream of money from AG and Card Providers, who raised their guarantees. This caused ATR lessor to recall his machines and caused the domino-effect.
It now looks like a nice fraud action from AmberGold to cover their actions...