Caracas would be better option from Manaus
If I were the captain of that Arrow Air Flight I would be flying to Caracas than Bogota.
Bogota is a high elevation airport, so if Arrow has to ferry the airplane with two engines it would be penalized a lot.
I had an engine anti-ice valve failure wich we discovered after landing in Valencia-Venezuela. The valve blew up and it made a hole in the engine N2, so we had to keep that engine off.
We had the ferry permit from the FAA and I can remember the penalties for high elevation airports and high temperature were high.
CCS-SVMI has a long runway, appropiate fire and recue equipement and those south american companies fly usually to and from Caracas everyday, so they must have agents and mantainance there.
From Manaus to Caracas is not more than one hour flight and not having to overfly any mountainous terrain is a big advantage when you have two engines in a DC10 fully loaded.
Maybe, they have chosen BOG because Arrow Air has more flight to that destination and their own mantainance people.
Barranquilla would be another good option, sea level and good runway.