Route requirements: General

This regulation sets the basic requirements for Part 121 carriers (airlines) to get FAA approval for new routes. Before flying scheduled operations on a route, the airline must demonstrate two things: that it can safely conduct scheduled flights between all airports on the route (including regular stops, provisional airports, and refueling stops), and that all required facilities and services are available and adequate along that route.

The facilities and services referenced include items like navigation aids, communications, weather reporting, and airport lighting—detailed in other regulations (§§121.97-121.107).

Importantly, the airline doesn't necessarily have to actually fly the route first. If the carrier can show that a test flight isn't essential for safety—perhaps because the route uses well-established airports and facilities, experienced crew, and proven aircraft—the FAA may approve the route without requiring a demonstration flight. This saves time and money while maintaining safety standards.

*This is a plain-English summary for study only. The official 14 CFR text on this page is controlling — always read the current regulation and consult a CFI.*