Indonesian rescuers waited for daylight Thursday to intensify the search for a Russian Sukhoi Superjet 100 with about 50 people aboard that went missing during a demonstration flight. The plane disappeared from radar screens south of the capital Jakarta 50 minutes into what was meant to be a brief flight on Wednesday. Rescue teams were headed on foot by early Thursday towards Salak Mountain, where the plane went missing, with officials saying helicopters would join the search after dawn. "So far we still have not found the plane. I cannot confirm but there is a possibility that it could have crashed," said Ketut Parwa, the capital's search and rescue agency chief who is coordinating operations. "If it had made an emergency landing we should have received some news via the radio or phone calls by passengers by now," he told AFP. Two helicopters searching for the plane Wednesday evening were forced to turn back due to strong winds and bad weather, and Parwa said choppers would be sent out again after sunrise. By midnight Wednesday, hundreds of rescuers had set up three posts around the mountain, one of them close to the town of Cidahu.