Price discrimination on airline seating

Thanks to tutor2u for this
http://www.tutor2u.net/economics/blog/price-discrimination-on-airline-seating?utm_medium=email&utm_campaign=Economics%20daily%20digest%20Tue%208th%20March%202016&utm_content=Economics%20daily%20digest%20Tue%208th%20March%202016+CID_55bcbbf61a862de9bd649ca5e86eb583&utm_source=CampMonitor&utm_term=Price%20discrimination%20on%20airline%20seating%20Were%20now%20used%20to%20paying%20different%20prices%20for%20air%20tickets%20depending%20on%20when%20we%20choose%20to%20book%20but%20a%20patent%20has%20been%20filed%20in%20the%20US%20for%20a%20new%20bench