Sunho wrote:

BTW, what about routes that generate at most 30 passengers per day?
Simply not worth serving?

There are Saabs, Beech 1900Ds etc that are still in service. The demand
for those exists, but you don't hear about it much because there isn't
much PR for such sales, usually small orders from regional carriers.

Also, you don't hear a lot of fanfare about new products because at that
size, there aren't revolutionary new engines that would further cut fuel
consumption. And the market is small enough that it is harder for people
like Saab to justify launching a totally new aircraft.