The co-pilot had flown about 600 of his 4,000 hours in the 737 .
The captain had 6,500 hours of flying experience , of which 1,700 had been in a Boeing 737 , the type of aircraft that was in the accident .
The co-pilot had flown about 600 of his 4,000 hours in the type .
The captain had 6,500 hours of flying experience , of which 1,700 had been in a Boeing 737 , the type of aircraft that was in the accident .