The Brazilian air force searched the densely forested Amazon region Saturday morning for a Gol airlines jet with 155 people aboard that went missing Friday, Brazilian aviation authorities said. Authorities said they were no longer certain the disappearance was caused by a collision with a private jet as they had earlier maintained. «During the afternoon there was another incident with a Legacy airplane, made by Embraer,» federal aviation authorities said in a statement issued early Saturday morning. «It is impossible to confirm that there is a relation between the incident which caused the (Legacy) crew to perform an emergency landing in Cachimbo and the disappearance of the Gol airplane.» Brazilian airport authority Infraero President Jose Carlos Pereira said Gol flight 1907 left the jungle city of Manaus and disappeared. It had been scheduled to land in Brasilia before heading to Rio de Janeiro's Antonio Jobim International Airport. Manaus is a major river city in the heart of the Amazon rain forest some 2,700 kilometers (1,700 miles) northwest of Rio de Janeiro. Pereira said five air force planes were searching for the missing Boeing 737 in a densely forested region. Gol said in a statement late Friday that there were 155 people aboard the jet _ 149 passengers and six crew members. Early Saturday morning, the airline released a list with 145 names. Gol did not explain the discrepancy between the number of people on the list and the number of people it said had been on board, the Associated Press reported.