Sometimes there can be a lot of lingo / jargon that throws in between the passengers. I thought it would be great to put all these concepts in one place with a simple definition. I certainly will not say it's a complete compilation, but it's at least a good start. These are some of the most common terms that, in my view, can be easily confused or misunderstood.
A la carte: This term can often be found on the menu in restaurants or at room service in terms of food. This means that each item is distinctly valuable, apart from being part of a meal or bundle. So if fries are "a la carte" it means you have to pay for them separately.
Affiliate: Business partner in a tourist destination. For example, the hotel can have a partner restaurant. The restaurant is owned and operated by the same company as a hotel, but is managed by a variety of people. Many times, if you eat at the hotel's partner restaurant, you can get a discount or incentive. Both will want to benefit each other, so they want to send their customers to each other.
Back-to-back tickets: When the passenger connects two return journeys, but with the opposite start and finish points. They use one segment each to achieve total lower costs. For example, the first ticket would be a return flight booked from Chicago to Dallas, and the second would be a return flight from Dallas to Chicago. The traveler would use the first stage of the first trip and the first stage of the second journey. This is most often done during the week, so you can avoid paying a higher fare during mid-week travel.
Baggage: This is either the weight or size your airline will be able to bring your flight to. It's usually a very rigid standard, so always make sure you're in a limited number of luggage allowed. If you are crossing, sometimes you will be charged another charge, or you will get some of your bags off.
Dropouts: Special days or period when no special rates are available. This is usually due to high time demands for flights when airlines know they can charge more money.
Reflection: This means that the number of flights was actually converted or lower. If you are lucky and the flight is subtle, you can get into the first class to fill the empty space they have. On the other hand, if the flight is interrupted, it is likely that you will be "hit" for the next available flight. One way to avoid this problem is to come up early, because sometimes they decide.