Photo of Flyest CRJ-200 at Buenos Aires Aeroparque (AEP) at 11:30am on the morning of 07Mar17. The aircraft reportedly arrived at the city airport only an hour earlier at 10:20am from Asuncion (ASU) where it had been parked for over a year. (Phil Perry Photo)
This plane is presumably LV-GIJ (c/n 7466), which flew with Sol Lineas Aereas in a joint venture with Air Nostrum of Spain that also involved a code-sharing marketing agreement with Aerolineas Argentinas / Austral Lineas Aereas that resulted in the aircraft being painted in Austral colors although with Sol titles.
The venture only lasted from late 2015 into early 2016 when the change of presidency in Argentina and resulting new management that took over at Aerolineas / Austral quickly put an end to the agreement on January 15, 2016.
Three CRJ-200's had been delivered by Air Nostrum to Argentina by the time of the closure with two being returned to Europe soon after the shutdown but with LV-GIJ being parked in Asuncion (ASU) ever since then.
Flyest has seemingly "come out of nowhere" while five other carriers participated in the much-publicized late December 2016 public route hearings.
According to La Nacion newspaper, Flyest will put four CRJ-200's into service between Buenos Aires (Aeroparque?) and Mar del Plata (MDQ), Rosario (ROS), Santa Fe (SFN) and Montevideo (MVD) with flights starting during the next month ! The carrier will reportedly be backed by US$ 45 million from Spanish investors (Air Nostrum, according to the blog Linea Ala) and employ 120 pilots, crew members and other staff.