'The popcorn comes at a price', 'The popcorn is not free', 'The popcorn Value $10', 'You must purchase the popcorn' or, basically, 'The popcorn isn't really free'. The statement, 'You may take your child within the flight free of demand' could well be in opposition to 'You need to pay to acquire your baby with a aircraft' or 'It isn't really free',