PZL Mielec (Polskie Zakłady Lotnicze - Polish Aviation Works) formerly WSK-Mielec (Wytwórnia Sprzętu Komunikacyjnego) and WSK PZL-Mielec is the Polish aerospace manufacturer based in Mielec. It is the largest aerospace manufacturer in postwar Poland. In 2007 it was acquired by Sikorsky Aircraft Corporation retaining the brand.