01/31/2011. Remarks by Johan Visschedijk: "Since PZL Warsawa-Okecie was founded in 1928, some 6,000 aircraft in 22 types have been produced. Over 1,000 of these were PZL-104 Wilgas since the type first flew on April 24, 1962. Still in production, the pictured version was the latest, introduced in 2005."