Recently, something happened to a friend of mine that should never happen during a trip. Or rather, something happened that you should never do it before you leave for a trip. He booked a flight through intermediary. In what sense will you tell me? Through a site that practically acts as an intermediary with the official company.
Notwithstanding that it is something that should never be done, why is it done? Why you plan to save something. In fact, these sites often offer lower prices than official sites, but then going forward with the transaction the prices go up and around and around you will end up paying the same amount as the national airline, perhaps even a little more, without even realizing it.
What if the price is really lower? Be careful, however, because it can happen, as happened to this friend of mine, that the final price paid is really lower, but i different services. For example, it is not specified boarding of baggage, which maybe you need? Pay it separately? In total you will pay more than a normal ticket bought on the official website, without the guarantee until the last that things have been done according to the rule.
I brokerage sites unfortunately they are not always completely reliable and to be honest they don't even give guarantees. By booking on an airline's website, you will have all your rights very clear and you will know who to refer to in case something happens. For this reason I invite you to read also the Passenger Card about the loss of baggage, and the site Low Cost Flights 4 You to find low cost flights, but I recommend that you always buy them on specialized sites, ie the official ones, in the end you will have saved!