If you are traveling with a musical instrument that will not fit in an overhead bin or under a seat, you may purchase a seat for it. You may purchase a seat for and carry your instrument into the cabin under the following conditions:
It must be placed in the first row.
It must be in a seat closer to the window than any Customer in the row.
It must fit in the seat, secured with a seatbelt.
It must not block aircraft signage.
Some musical instruments (e.g., double bass, cello, etc.) cannot be secured in a seat and must be transported as checked baggage.