The short version
In the United States, an aircraft can only be chartered to the public by a company holding an FAA Part 135 air carrier certificate. That certificate sets rules for pilots, training, maintenance and rest.
If a flight is sold as a charter and the operator is not a certified carrier, it is not a legal charter.
Broker and operator are different
JDjets is an air charter broker. We arrange your flight; a certified carrier operates it. We do not own or operate aircraft.
Your firm quote names the operating carrier, so you always know who is actually flying you.
What we check
Before a firm quote we check the operating certificate and insurance documents. Independent ratings such as ARGUS, WYVERN and IS-BAO are recorded only when the operator actually holds them.
What you can ask
Ask for the operator name and certificate number. A legitimate charter provider will give them to you without hesitation.