A couple of questions for the pros here.
1- Is it possible to obtain a clearance to fly direct to your destination, in a route with no direct airway, above FL 240?
2- If 1 is affirmative, it seems to me that the Legacy was cleared direct to Manaus, not passing trough Brasilia. The only waypoint mentioned on the clearance was Poços de Caldas. So why the Legacy pilots understood they should go through Brasilia, if the clearance didn't mention that?