Which type of onboard sales are never discounted?

When considering onboard sales that are never discounted, upgrades stand out. The primary reason is that upgrades typically involve enhancing a passenger's experience, such as moving from a standard seat to a higher class with more amenities or comfort. These upgrades are often priced at a premium because they offer additional value and service, making them an essential part of the overall travel experience.

In the case of merchandise, food and beverage, and travel packages, these can often see promotional discounts or special offers as a way to encourage more sales or as part of a marketing strategy. Unlike upgrades, which are tied directly to the level of service and experience, merchandise, food, and travel packages can fluctuate in price based on demand, inventory, or promotional strategies.

Thus, upgrades maintain a stable price point without discounts due to their specific nature aimed at enhancing the travel experience, making them a unique selling point for the service provider.