Part of an airplane

CABIN

Think of where passengers sit and store their carry-on luggage during a flight. It’s the enclosed space that separates travelers from the cockpit and cargo hold.

The clue "Part of an airplane" is a straightforward definition pointing to the main passenger area inside the aircraft. "Cabin" fits because it refers to the enclosed space where travelers sit during a flight, distinct from other parts like the cockpit or wings. There’s no wordplay here—it’s a direct reference to a common term used in aviation.