Convair 580 N5806
aircraft began life as United Airlines' N73150 "Mainliner Salem"
delivered in 1954.
It appeared to have
led a rather "on again - off again" existence after that, being
first to a
Convair 540 by Turbo Prop Conversions (Napier Eland turboprops)
then to Allegheny,
then back to Turbo Prop again to have the Elands taken off and be
converted back to a
'straight' CV 440 and then back to Allegheny as N8427H. It
finally converted in 1965
to a true Convair 580 with Allison 501 turboprops, becoming
N5806. In later life, following a stint in Canada, it
wound up in 1994 with Air Freight
NZ Ltd of Christchurch, New
Zealand and is, I believe, still flying (late 2005).