keesje- I like seeing your designs, but I can tell you that wing is far too small, and the sweepback is not nearly enough. Tailplane also too small. But the idea is good. A stretched A321 with a new large wing (like the 757), or just a root section added, and far more powerful engines- a sort of mini-787. As the 757s are getting so old, it would be a market killer! Unfortunately, the only replacement for a 757 is....a 757. Because of it's power and large wing, it is a strong performer on long range routes that the 321 just can't handle.