Premium economy didn't exist before 1992. Every aircraft in the sky had two classes or three. Economy. Business. First. The space between economy and business — roughly $1,500 of fare gap on a long-haul sector — was empty.
EVA Air saw it first.
The Taiwanese carrier launched Evergreen Deluxe Class on its transpacific routes — wider seats, more legroom, better meals, and a dedicated cabin. Not business class. Not economy with a free drink. A structurally distinct product priced 60–70% above economy and 40% below business.
Airlines ignored it for a decade. Then the maths caught up.
Business class seats generate the highest per-passenger revenue, but they consume enormous floor space. A lie-flat business seat on a 777 occupies roughly 2.0 square metres. An economy seat occupies 0.5 square metres. The revenue-per-square-metre calculation favours business — but only when load factors stay above 75%.
When corporate travel budgets tightened after 2008, business class load factors dropped below that threshold on dozens of routes. Airlines were flying half-empty cabins in their most expensive real estate.
Premium economy changed the arithmetic.
A premium economy seat occupies roughly 0.8 square metres — 60% more than economy, but 60% less than business. At a fare premium of $800 to $1,200 over economy on long-haul, the revenue per square metre often exceeds business class at equivalent load factors.
The seat pitch tells the story. Economy: 31 inches. Premium economy: 38 inches. Business: 78 inches. Seven extra inches of legroom generates nearly the same spatial yield as 47 extra inches of lie-flat luxury.
By 2024, every major long-haul carrier operates a premium economy cabin. Lufthansa, ANA, Singapore Airlines, Qantas, British Airways, Air France, Delta, United — all of them retrofitting existing widebodies to carve out 30 to 60 premium economy seats.
The cabin that didn't exist 30 years ago is now the most profitable square metre on long-haul aircraft.
Seven inches of legroom. A trillion-dollar insight.