<sod>During its early service, the PC-6 Porter was noted for its high level of comfort and usability against competing aircraft.<ref>Fricker 1962, pp. 100-101.</ref> <eod>
<sod>During its early service, the PC-6 Porter was noted for its high level of comfort and usability against competing aircraft.<ref>Fricker 1962, pp. 100-101.</ref> The type has also proven to have a long service life; by 1993, roughly 440 of the 500 PC-6 Turbo Porters completed by that point were still in service.<ref name = "moll 64">Moll 1993, p. 64.</ref><eod>