Travel booking systems manage promotions and discounts through a combination of automated applications and integration with marketing campaigns. The systems can automatically apply promotional codes, discount vouchers, or special offers during the booking process, based on predefined rules and conditions. This automation ensures that discounts are applied consistently and accurately, reducing manual effort and minimizing errors. Booking systems often include features for creating and managing promotional campaigns, allowing travel companies to set up and track various discount strategies. Integration with marketing tools enables targeted promotions based on customer segments and booking patterns, enhancing the effectiveness of promotional efforts and driving increased bookings.