JetBlue is the largest air carrier of United Airlines and offers a comfortable travel experience to its passengers. JetBlue Airways offers a variety of flight services for any kind of situation, and UMNR service is one of them. JetBlue Unaccompanied Minor policy is about keeping kids safe and happy when they fly alone. This service is required for children aged 5 to 13 who travel without parents/guidance. Kids aged 14 and up can get extra help if needed. JetBlue limits the number of unaccompanied minors to three per flight to ensure they get the best care from the crew.