Yes, British Airways allows solo flights for kids 15 years or older, but those under 14 need a companion aged 16 or older to ensure a smooth and safe journey under Avelo Airways Unaccompanied Minor Policy. Provide proper traveling documents with the airline including about the child and the designated adults for drop-off and pick-up. for more visit here–
Source: https://www.airlinesunaccompaniedminor.com/avelo-airlines-umnr-policy