With the chance of derailing this thread, came across this a couple days back (Close enough to the 152)
In response to the original question
The BAE ATP will always be my preferred choice with routes under 600nm. The speed difference between the Q400 and ATP
means the difference between the two shouldn't be more then hour if that, as-well as the ATP having a lower average fuel burn and a slightly
shorter take off run, it wins every time.
Your regional aircraft should be doing a bare minimum of 3 flights a day, preferably four or more, any less and you'll just bleed money