NOK Air Sakon Nakhon flights

In a press release published April 5th the text reads in part:
"... and Sakon Nakhon (Increase from 1 to 2 Daily). These flights operates with Boeing 737-400..."

Press release can be found at airlineroute.net or  routesonline.com

In an article dated April 7, 2011 routesonline.com reports:
"..and a second daily flight to Sakon Nakhon from May 3, using a Saab 340.."

My vote goes to the Saab 340

Boeing 737-400

First flew in 1988 and production ended in 2000.
Has a seating capacity of up to 168

Saab 340

First flew in 1983 and production ended in 1998.
Has a seating capacity of 37