The 881-member union at LAN Express, which mostly covers routes within Chile and also has some flights to other South American destinations, rejected LATAM's contract offer last week and asked for government mediation in contract talks.

After those mediated talks fell through earlier this week, the union representing maintenance and ground support staff said it would strike.

"The strike has started in all of the country," Eric Arce, a senior official of the union said.

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