You can reserve a seat up to 48 hours before departure on payment of a non-refundable processing fee of EUR 9/GBP 7,00/USD $14, either when you book your flight online or afterward by calling the Service Center. Customers who book with a TUI Card/Flex-Rate can reserve a seat free of charge. On many flights, you can book an XL seat at the emergency exit for a charge of EUR 30/GBP 20/USD $40 per person per flight segment.