Aerolineas Argentinas has made this announcement (translated from Spanish):
We like to inform you that all operations on Monday, November 26, 2018 had to be cancelled due to a strike by the unions ALPA, UALA, APA, and others. We regret the inconvenience that this situation outside the company creates.
Top Copyright Photo (all others by the airline): Aerolineas Argentinas Boeing 737-81D LV-CXT (msn 39426) AEP (Ken Petersen). Image: 944538.
Aerolineas Argentinas aircraft slide show: