Four persons were killed on Sunday when two small planes collided mid-air, authorities said.The planes, a four-seat Cessna-182 and a six-seat Piper-28, collided in mid-air and crashed near the town of Godollo, about 30 km northeast of Budapest, Pest County Directorate for Disaster Management said on its website.Three persons, including one child, aboard the Cessna died while four in the Piper jumped to safety before the collision using parachutes, leaving only the pilot who died in the crash, Xinhua news agency reported.Rescue helicopter found the Piper in a heavily wooded region while the Cessna went down in a plains area.