Like others said, in general T-props are more efficient on short stage lenths, and as the legs get longer, jets are more efficient. As far as production the SF-340 is no longer being made, total production run was 459 SF340 A, B's and B+'s. Mesaba's newest is #457, and #'s 458 & 459 went to Japan. Aircraft 460 was on the production line but not completed when the line was shut down. The tail section to AC 460 was used to repair an "A" model, AC 142 when Mesaba's hanger in DTW fell on it in a Tornado several years back. There were only 36 Saab 2000's completed, and of those I believe 2 have been written off due to damage. Would have been a heck of an aircraft, a LARGE improvement over the 340. 100 kts faster and over double the horsepower of the 340.