To my knowledge Boeing currently considers a shrink and a stretch of the Boeing 717-200. The shorteer one, called 717-100 is supposed to carry around 70 passengers, the bigger one called 717-300 120-130 passengers. I don´t know if this idea is thus clever because of several reasons. First the 717-300 reasons:
1. Very long then, tube effect.
2. Too much competition, in this area are the very succesful A319, the B737-300, the B737-700 and the B737-600. Already today the 717-200 and the 737-600 competing hard for every 100-seater order which means inner-Boeing competition and pressure on the prices. Quite bad.
1. From the technical side no problems I think.
2. Extremly hard competition in this market segment. Including the 711 are the CRJ700, the 728JET, the ERJ-170 and the Avro RJ70 as 70-seating jets. While the RJ70 isn´t worth to be counted because of only about 10 orders in ist whole lifetime the CRJ700, 728JET and ERJ-170 have grabbed a lot of very interesting customers i.e. Lufthansa, Crossair, American Eagle, Horizon Air which are all out as potential 717 customers now. BTW, has anyone heard something about upcoming regional orders?
3. The 711 should be heavier as the new-generation RJs are. This means increasing the airport fees and uplifting the direct operating costs.
Conclusion: To me seems as if the 717 programm wasn´t a very well idea. Although it might get some more customers existing regional carriers will rather go for the other regional jets and mainlines, here American Airlines might be named, won´t buy it because of their cost structure. If they introduce this type in all three possible versions the mainline pilot salaries have to be paid which are usually a lot higher then regiojet pilot´s.