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These failures were deeply rooted in fundamental, immutable physics: extremely high fuel consumption and reduced range compared with subsonic aircraft; narrow fuselages leading to few cramped, economy-size seats; and unsatisfactory reductions in passenger’s trip duration when including ground transportation, security and prudent time margins.

“The cleanest place in New York,” read the tagline, as a dancer ran her hand suggestively up an economy-size bottle.

Amy stuck a tablespoon into an economy-size vat of mayonnaise.

I headed straight for the vitamin section, where the economy-size house-brand red yeast rice was on sale — buy one for $22.99, get one free.

Death is inevitable, but we continue to make long-term bets: My wife, Jeanne, and I might have enough economy-size jugs of Tide and gigantic packages of toilet paper rolls, bought on regular trips to Costco, to survive into the next century.