I think the -300 was around 140 pax. A winglets have been studied but I don't think there are plans to put one on it. The benefits were negated by extra weight tough they weren't the blended type put on the 37. The problem with stretching a 717 and making it go farther is it starts to conflict with 737 sales and Seattle already isn't too keen on pushing the adopted ba$tard child. It's a shame because it's the best airplane to ever come out of Long Beach.(next to the DC3)