I'm curious to know why they went with (what I am guessing are) turboprops versus jet engines. Anyone know? Is it a standard for that class of aircraft?
Add a tiny bit to this...
Do you mean jets as in turnbines or turbofans? Anyway, in addition to the already stated above, the aircraft is probably designed with short haul in mind. There are two considerations here...
1). Pound for pound, turboprops are more "efficient". What this translates into is that for a similar weight aircraft, you can have a slightly smaller, less powerfull "jet" (ie, consumes less fuel per hour) driving that propeller than if it were a pure jet. As time is not such a great factor on the short haul, (the difference between a turboprop and a jet flying between Quito and Guayaquil for example, is about 5 to 10 minutes) it becomes a cost saving incentive.
2). Because turboprops are therefore smaller, generally, making the wear and tear a little less than on a big jet, their maintenance can be done on an hours interval schedule. Jets, however, have their maintenance done on a cycle basis. Just to correct a misconception about cycles... a cycle is an engine start, power up to takeoff thrust, and shut down (most people think of a cycle as an actual flight of the aircraft, but you can do a cycle without ever leaving the ground). Anyway, on the short haul routes, a jet builds up cycles very quickly, increasing its maintenance periodicity and thereby cost to the operator, wheareas turboprops plod on until they reach their hours (with a few exceptions that are out of the scope of this description). Therefore, they are a cost saver in this sense, too.
Hope that helped.
