To maximise your profits, consider only E195 (my own experience). Profits vary from 200k to 400k / week, with some business seating (3 to 6 seats). They are expensive to lease, but with time, if you buy them, they will be a good investment.
For me the 717 is too small for the era it flies in. Especially if you fly it anywhere near it's max range when the fuel prices are up. It even carries less people than the MD87 so it's more comparable to a DC-9-50 which was really a stretched regional jet. To make money on the routes it is designed for, 717 should carry more people. Or if you are going to use it as an RJ then you are as well to get an aircraft designed to be one that has better fuel burn.
I operate 17 AN 148e s on under 700 mile rotations 3or4 flights aday in brazil and they are making me between 150 to 320k a week, I dont know but would say thats not bad money.. I am preety happy with them. i also operate 3 AN 158 and they are not quite so good in my opinion.
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