It seems the specific problem was that military planes were being used instead of civilian planes:
That does make sense to me, since I'd feel less comfortable if a military plane was flying into my country, whereas I'd be more comfortable if a regular civilian flight was used instead. From the perspective of a Colombian, I would be concerned about how national security would be affected by giving permission for military planes to operate when they wouldn't otherwise have permission.
There is more discussion that might be useful here: https://ponder.cat/post/1453581