Charter, also called air taxi or ad-hoc flights require certification from the associated country's regulating body such as the FAA in the U.S. The regulations are differentiated from typical commercial/passenger service by offering a non-scheduled service. In the U.S. these flights are regulated under FAA Part 135. There are some cases where a charter operator can sell scheduled flights, but only in limited quantities.
Each traveler has the opportunity to select the plane that will be most comfortable for the chosen group. Hire a helicopter for the perfect two-person sightseeing trip over upstate New York; take a group of your closest friends to island hop off the coast of mainland Florida on a turboprop plane, great for short trips. For cross-country travelers—like an East Coast group of friends planning a bachelor party or bachelorette weekend in Las Vegas—a chartered super mid-size jet that flies nonstop could do the trick. Even jumbo jets like 747’s can be chartered for a larger group—think 50 to 500 people—so that everyone can fly together without having to worry about booking tickets on a commercial airline. The best part? No luggage fees.
You will be told how much the hold can take on your chosen aircraft and can upgrade if you feel more space is needed. This will generally be far more than that of a commercial airline. You may also need to upgrade if carrying things like golf clubs and skis. If travelling with a gun, you will need to provide a license and the gun and ammunition must be kept separate. It is then at the captain’s discretion whether it can be on board.