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The plane had passed a safety inspection about a month ago and was authorized to fly, Cubillo added.
The cause of the crash is still under investigation.
For us, it looked like some sort of problem, and it was trying to get back to the runway.
With the turn it did, it had one wing up vertical, and the other hit the trees,' he said.'When we arrived, it was all in flames....
'We are deeply saddened by this immense tragedy.'Irene and Bruce are also said to have donated thousands of dollars to Seeds of Peace, a US-based organisation which focuses on peace-building between young Israelis and Palestinians.
William, a freshman at the University of Pennsylvania, was also involved in Seeds of Peace, and his aunt revealed on Facebook he had been planning a career in politics.
Another resident, Efrain Rojas, told the newspaper La Nacion that the plane was 'too low' after take-off.'It did a turn to the left.
The plane seemed to 'cartwheel' before it crashed a minute after takeoff from Punta Islita airport on Sunday, witnesses said.
Geissler was a tour guide with Backroads, the company that booked the flight.
At a news conference, Enio Cubillo, director of Costa Rica Civil Aviation, said the Nature Air charter flight took off just after noon Sunday from Punta Islita and was headed for the capital of San Jose when it crashed. The plane burst into flames on impact, according to rescue officials and locals.
Costa Rica's Civil Aviation agency said the pilots had tried to land at Punta Islita earlier Sunday to get the passengers but aborted because of 'the gusts of wind.'The aircraft was up-to-date with its certifications and had been inspected a month earlier, the agency said.'There had been a lot wind, really strong,' one resident in the area told AFP on Monday.