Originally Posted by
cs57
1) The answer MAY be the Antonov An 26, although it entered service in Russia about 10 years after the F-27.
Although I do not think the An 26 was ever operated domestically in scheduled passenger service by a U.S. air carrier.....
With regard to the excellent question posed by
tonywestsider, I'll make a wild guess here with the Nord 262, although this high wing, twin turboprop is a bit on the small side when compared with the "Herald" and "Friendship"....
The Nord 262 was manufactured in France and was powered by Turbomeca "Bastan" engines. Swift Aire Lines operated the Nord 262 in California. I flew on the aircraft several times SBP-LAX. And I believe that Lake Central also operated the Nord 262 in the upper midwest.
There was also a U.S. version of the Nord 262: the Mohawk 298 which was powered by Pratt & Whitney PT-6 series engines. Allegheny operated the Mohawk 298 in the northeast.