unaccompanied

【原文】
There are also fees at many U.S. airlines for early boarding, unaccompanied minors, processing a ticket purchased with award miles, getting a ticket issued by an airline reservations clerk, using a mileage-based upgrade, and overweight bags and oversize luggage.

【単語の意味（日本語）】
連れのいない

【その他の単語】
minor 未成年者