What is one requirement for cross-country flight?

For a flight to qualify as a cross-country flight under FAA regulations, it is defined as a flight that involves a landing at an airport that is located more than 50 nautical miles from the point of departure. Landing at this destination is critical because it confirms that the flight has not only navigated the distance but also completed the leg of the journey at a different airport. This requirement helps ensure pilots gain experience in navigation, planning, and operating in different airspaces, which are essential skills for a more comprehensive understanding of flying and preparing pilots for more complex operations in the future.

The other options do not meet the specific definition of cross-country flight as outlined by the FAA, either because they describe distances that are either longer or shorter than required, or do not require a landing, which is a key component of the definition.