In this month’s "Dear Eugene," we ask experts why bringing smelly food onboard a flight, such as that tuna fish sandwich you bought inside the terminal, is an etiquette faux pas.

Inspired by our intrepid founder, Eugene Fodor, Dear Eugene is a monthly series in which we invite readers to ask us their top travel questions . Each month, we’ll tap travel experts to answer your questions with the hopes of demystifying the more complicated parts of travel. Send your questions to [email protected] for a chance to have them answered in a future story.

Dear Eugene, I was running to catch a flight and, starving, picked up a tuna fish sandwich from one of the restaurants in the terminal. Once settled in my seat, it became very clear that the passengers around me were not happy with my

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