Discounts!!! Yes, they do have various names, and each line handles differently. You'll get mailing, regular or emails, some with very substantial last minute deals. Great if you live near where the ship leaves from, and flying not required. Upgrades are another thing, some do not include balconies, but fail to tell you that originally. Special cocktail parties, easier boarding and disembarking. I've personally never heard of tenders, but not saying that some might not do it. Also, airline deviation fee is waved which can be a huge saving on some lines. We're doing Celebrity in Europe this Summer, wanting certain flights. We would have paid $75/person, which we got for free. Anything that is free, is well worth it to me. Hope this gives you a little idea how it's handles.