FLEET UPDATE: Aerolineas Argentinas placed fourth 737 MAX 8, LV-HKV, back into service on 01Oct21

Aerolineas Argentinas 737 MAX 8, LV-HKV (c/n 44294/6807), taxis at Buenos Aires Aeroparque (AEP) on 29Mar18, a little over a month after it was delivered to the carrier.  (Phil Perry Photo) 

Aerolineas Argentinas grounded all five 737 MAX 8's in its fleet when the type of aircraft was grounded worldwide in March 2019.  With the recertification of the type in November 2020, Aerolineas started to prepare its MAX's for a return to service on a gradual basis as air traffic resumed in Argentina.  

Aerolineas' first 737 MAX 8, LV-HKU (c/n 44293/6753) returned to regularly-scheduled service on 23Mar21, followed by LV-GVD (c/n 64207/6661) and LV-HKW (c/n 44296/6926) on 20Jul21 and 05Aug21, respectively.     

The latest MAX to be reactivated was LV-HKV (c/n 44294/6807) on 01Oct21.  The sole remaining MAX is LV-GVE (c/n 64208/6717) which is expected to return online in December.  Aerolineas holds orders for seven more of the 737 MAX series for a total of twelve airframes expected to be delivered by the latter part of the decade. 

So far, the reactivated Aerolineas 737 MAX 8's have flown exclusively domestic services in Argentina with only a handful of exceptions, but they are slated to eventually fly internationally, especially on "longer" and "thinner" routes with less passenger traffic, such as Buenos Aires Ezeiza (EZE) to Cancun (CUN) and Punta Cana (PUJ).   

Sources:

https://www.aviacionline.com/2021/10/aerolineas-argentinas-reactivo-otro-boeing-737-max-solo-queda-uno-almacenado/