In order to obtain accurate data you will need to pay a consultancy to carry out a cost analysis, unless you have insider information. Airlines are very careful about who they give their costs to, and as is already suggested, costs vary significantly according to the operation. Manufacturers will give ballpark figures which you should be able to obtain, however, they don't necessarily reflect the actual operating costs accurately.
$1700 for an ERJ 145 seems very low. Would be interested to know where you have obtained that information WOD-DET-DVR?