Images of American Airlines Boeing 737-823 (reg. # N974AN) pre- and post-winglet installation

This figure contains two photographs of American Airlines Boeing 737-823 (reg. # N974AN) taken by Blend Qatipi on September 13, 2005, at Dallas/Fort Worth International Airport (KDFW) (https://www.jetphotos.com/photo/548461) before the installation of winglets (panel A), followed by a photo for the same aircraft (reg. # N974AN) taken by Joe Statz on October 29, 2005, at Dallas/Fort Worth Int’l Airport - KDFW (https://www.jetphotos.com/photo/5653925) after the installation of winglets (panel B). Photos are downloaded from JetPhoto.com. We are grateful to Blend Qatipi and Joe Statz for granting us permission to use their photos in the paper.