Side view of N37277.

The regular blended winglets on United's other 250+ 737NGs reduce fuel consumption by 3.5% to 4% on flights over 1,000 nautical miles. The split scimitar upgrade—which costs $545,000, before discounts–will reduce fuel burn by up to 2% more.

Once United's 737NG fleet is upgraded with the SSWs, they could save up to $60 million dollars each year.