EVERETT — For many flyers today, Boeing’s 737 means shoehorning into a seat that seems every year to shrink, racing to shove a roller bag into crammed overhead bins, and, when nature calls, finding the sole path blocked by the drink cart.

Single-aisle airplanes such as the 737 might be the unglamorous city buses of commercial aviation, but an Everett aerospace engineering firm and a British aviation company want to put Boeing’s workhorse on the front lines fighting environmental devastation.

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