14 CFR Part 251

5 sections.

§ 251.1
§ 251.1 Definitions.
§ 251.2
§ 251.2 Applicability.
§ 251.3
§ 251.3 Small musical instruments as carry-on baggage.
§ 251.4
§ 251.4 Large musical instruments as carry-on baggage.
§ 251.5
§ 251.5 Large musical instruments as checked baggage.

This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.