Easy way to tell a AA 737 vs AA MAX apart. Blended winglet vs a updated split scimitar aka Advanced technology winglet. Another way is if you have a view of the Engines the 737 max has chevrons on the aft end of the thrust reverser.
Split Scimitar winglets are named after a Middle Eastern sword with a distinct curved blades ending with a sharp point. Split Scimitar winglets were developed by Aviation Partners Boeing and are available for the 737-800 and 737-900ER after entering service in 2014.
Article: http://www.b737.org.uk/winglets.htm
737 max737Max
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