Cheapflights.com predicts that air etiquette or “airtiquette” will be a major issue in 2015. As passengers are forced to sit closer together, putting a strain on already TSA-tested nerves, issues like “hacked boarding passes, ‘Seat Defenders’ . . .the predominance of the in-flight selfie … and carry-on meals that often pack an odor punch (are) all creating flash points for passenger conflict,” according to Editor Melisse Hinkle. She adds that airlines are taking a zero tolerance stance on air rage.