Had to google this.
JetSmart is an ultra low-cost Chilean airline created by US investment fund Indigo Partners, which also controls US airline Frontier Airlines, Mexico's Volaris and Hungarian airline Wizz Air. Its primary base of operations is Comodoro Arturo Merino Benítez International Airport, in Santiago, Chile.
So basically, the Spirit Airlines of Chile
Not to be confused with JetSmarter, which I used to have a membership to...