JetBlue Has Made a Seat Guarantee for Parents and Kids JetBlue has announced a guarantee that is sure to please parents with young children.  The airline has introduced a new system that guarantees children 13 and under will have a seat with their parents at no extra cost.  “We want to do everything we can to put parents and families at ease by providing a smooth trip each time they choose JetBlue,” said JetBlue President and COO Joanna Geraghty.