I'm mainly worried about the precedent it will create. If you add these links, someone else will like to add links to other airport database websites, and them maybe review websites for airports, and before we know it we will have a very long list of weblinks for airports, buildings, restaurants, hotels, schools, ... See also here https://community.openstreetmap.org/t/add-key-to-link-third-party-website-with-pictures-menus-description-or-reviews-about-pois/100390 for a similar discussion