Can turboprop freight conversions prevent a glut of used passenger aircraft?, Issue 16 Apr/May 2001

There are about 1,100 turboprop freighters in service. These operate for
major small package carriers, various postal services and independent
airlines. Many are now more than 30 years old, and small package traffic is
growing at about 20% per year. This is expected to stimulate the
conversion of more than 800 aircraft in the next 10 years.