Which of the following is NOT a pre-solo requirement?

A key component of pre-solo requirements for obtaining a pilot's certificate is ensuring that the student is legally and physically able to fly and has sufficient knowledge and training to do so safely. Medical certification is essential because it ensures that the pilot meets the necessary health standards. The TSA endorsement validates that the student is cleared to fly under the security regulations. Additionally, completing a knowledge test is fundamental, as it checks the student's understanding of aeronautical concepts necessary for safe flying.

In contrast, cross-country flight experience is not a mandated pre-solo requirement for students. While cross-country training is important for overall flight proficiency and is necessary for obtaining a private pilot certificate, it is not specifically required before a student can fly solo. A solo flight can occur after a student demonstrates proficiency in basic flight maneuvers and safe operation of the aircraft, which can be achieved without having completed a cross-country flight. Thus, cross-country flight experience stands out as not being essential for the pre-solo phase.