How does a STOL aircraft wing differ from a wing currently used on modern civil airliners?

Based on aircraft forecast models, and the potential for growth in developing countries is high, I have decided to do my final year aerospace engineering research project on designing a new STOL 150 seat airliner. I understand that STOL wings have low takeoff/landing speeds, but disappointing cruise performance,... show more Based on aircraft forecast models, and the potential for growth in developing countries is high, I have decided to do my final year aerospace engineering research project on designing a new STOL 150 seat airliner. I understand that STOL wings have low takeoff/landing speeds, but disappointing cruise performance, but I dont understand why that is the case when compared to modern airliners.
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