Winglets start with the Boeing Business Jet .
Winglets have been factory installed onto the Boeing 737 Next Generation as well as retrofitted on 737 ' Classic ' ( Boeing 737 - 300 and - 500 ) and 757 and 767 - 300ER airliners .
Starting with the Boeing Business Jet , winglets have been factory installed onto the Boeing 737 Next Generation as well as retrofitted on 737 ' Classic ' ( Boeing 737 - 300 and - 500 ) and 757 and 767 - 300ER airliners .