Fuel efficiency is the Holy Grail in the airplane business, or at least one of them, and Boeing today unveiled a new design for the wingtips of its overhauled 737 MAX that the company says will reduce fuel burn by an additional 1.5 percent over long ranges.

It’s a dual winglet, a new strategy to reduce the drag caused by airplane wingtips.

Boeing says traditional winglets reduce fuel burn by 4 percent, and the new design boosts that to 5.5 percent by increasing the effective wingspan of the plane, while still allowing it to fit into existing spaces at airport terminals.

You won’t start seeing it at airports or from your window seat until 2017, but you can check it out in the video above (via Airline Reporter) and pictures below, from Boeing.

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