Final answer:
To fly under BasicMed, a pilot must carry the aviation medical self-assessment course completion checklist and the medical education course completion certificate onboard the aircraft.
Step-by-step explanation:
Under BasicMed, a pilot must carry aviation medical self-assessment course completion checklist and the medical education course completion certificate onboard the aircraft. These documents serve as proof that the pilot has met the requirements set forth by the Federal Aviation Administration (FAA) for flying under BasicMed.