Another irregularity found is that the plane was allegedly not certified to fly above 29,000 feet, and in the flight plan submitted to Bolivia it was noted that it would fly at 30,000 feet. Approval of this flight plan, therefore, was not correct, Bonilla said.
I'm confused. In the FPL copy we've seen in the media
such as here the cruising level is entered as F280. No mention of 30,000 feet.