Continental installed winglets on nine of the company 's 737 aircraft during the quarter , and now has winglets on over 275 of its mainline aircraft . In February , Aviation Partners Boeing , a joint venture of Aviation Partners , Inc. and The Boeing Company , completed the world 's first blended 757-300 winglet installation on one of Continental 's aircraft . Continental plans to begin installing winglets on all 757-300s later this year . All of the company 's 737-500s , 700s , 800s , 900s and 757-200s have winglets , as do select aircraft from Continental 's 737-300 series fleets . Winglets increase aerodynamic efficiency and decrease drag , reducing fuel consumption and emissions by up to five percent .