It's a bit more complicated than that. Part 121 covers airlines, think schedules and big planes, Boeing and Airbus. Part 135 covers smaller planes for hire, Citation, Piper Navajo. Part 135 says (I added the bold):
135.243 Pilot in command qualifications.
(a) No certificate holder may use a person, nor may any person serve, as pilot in command in passenger-carrying operations—
(1) Of a turbojet airplane, of an airplane having a passenger-seat configuration, excluding each crewmember seat, of 10 seats or more, or of a multiengine airplane in a commuter operation as defined in part 119 of this chapter, unless that person holds an airline transport pilot certificate with appropriate category and class ratings and, if required, an appropriate type rating for that airplane.
When you says charter, do you mean a company that says, "We will take you where you want to go when you want to go in our plane for XXXX dollars?" The legal term for that is "holding out." That would fall under 135 and the PIC would need an ATP with a Citation type rating under US 135 rules.
Now if you own a Citation or even a 747 you can hire pilots with just a COMM rating to fly your plane. You can take friends along or you can tell your pilots to take your friend to the US but your friend can't pay for the flight. These flights would fall under part 91 or 125 and only the COMM is required with the type rating.
All of this is for a N registered aircraft. If it's Venezuelan, their rules would apply.