Musical instruments on a plane
Measure the case and confirm cabin space
At a US airport, security screening and cabin stowage are separate decisions. Measure the closed case, including handles and protruding parts, then check the operating airline's size, weight and instrument policy. TSA screens musical instruments in carry-on and checked bags, but a carry-on instrument may need a physical inspection. Tell the officer if the case or instrument needs careful handling. The US Department of Transportation guide links to the rules and practical advice for flights covered by US law.
Protect strings and bows
For a guitar, support the neck and stop the body moving inside the case. Secure a violin and its bow separately so they cannot strike each other. A rigid case is the safer choice when the instrument will be checked. Passing a US checkpoint does not reserve a space in the cabin; confirm the packed case with the airline before travel.
Drumsticks, brass and cymbals
Cover the tips of drumsticks and check the complete sleeve against your cabin allowance. TSA marks brass instruments as “check with airline” for carry-on and permits them in checked baggage. Cymbals may need additional screening; cushion their edges and keep the case accessible. Heavy stands and other hardware should be assessed separately. See the TSA item list for these US screening entries, and check other departure airports on your route.