Others say they have experienced no problems with Boeing aircraft.
The Boeing 707 aircraft involved in the accident was just four months old.
The first officer had 3,981 total flight hours, with 3,081 in Boeing 737 aircraft.
The airline used Boeing 737 aircraft in the 1980s and 90s.
They said its operating costs would be lower than those of the Boeing aircraft on short routes.
The biggest change in this period was when the first Boeing 737-300 aircraft arrived with a silver body.
A Boeing 747 aircraft is seen to hit the top of the tower and destroy it.
The airline is planning to take delivery of 400 new Boeing aircraft between now and 2012.
It was extended in 1995 to allow Boeing 737 aircraft to take off with maximum weight.
It also added to the company's growing fleet of Boeing aircraft (the 737, 757, and 767).
