Which of the following is NOT a method for obtaining a medical certificate?

Obtaining a medical certificate is essential for pilots to ensure they are physically fit to fly. Among various methods, using an Aviation Medical Examiner is a formal and recognized way for pilots to acquire a medical certificate, as is BasicMed under Part 68, which allows pilots to operate under specific conditions after completing a physical exam by an authorized healthcare provider.

Self-declaration refers to a pilot's acknowledgment of their medical fitness under certain regulations, commonly associated with BasicMed, where the pilot must still follow guidelines and complete specific health-related checks or forms.

A private practice doctor can provide general health advice and perform routine health checkups, but they are not specifically designated as Aviation Medical Examiners unless they meet the necessary certification requirements. As a result, while they can provide assistance in aspects concerning health, they lack the authority to issue a formal medical certificate for aviation purposes.

Thus, the option referring to a private practice doctor is not a method recognized for obtaining a medical certificate, making it the correct answer.