These are T-35 airplanes from the Chilean Airforce. They fly in formation every year for graduation. Do a little research and by the way I’ve seen this same damn thing on this site before. This should never have been posted here.
The Video doesn’t really show quite how big this object was, if it was an object. The people we were staying with in Santiago said that weird lights in the sky are seen at least once a week, but this sighting really impressed them. For me it was something I’ll never forget, personally I’m convinced it wasn’t a natural phenomenon or something man-made.