Trabber compares all the flight offer from [a still somewhat limited list of] providers and shows the final prices of the flights, without hidden cost. The Trabber results are the same that one would get by directly going one by one to all the web sites. The difference is that, with Trabber, one only has to search once to find all the available flights.
The tool was launched by two young Spanish entrepreneurs, with the help of a usability expert. The first version was in Spanish and that seems the most advanced site for now. Meanwhile, beta versions of the site have launched in the US, the UK, Italy and Germany.
Their business model is based on traffic redirection, they told me. The first impression is one that feels like Google, so perhaps being bought by Google might be their other business goal.
Some hickups need to be fixed still (it didn’t recognise Milan as a “nearby” airport to Turin and has only 6 traditional airlines in the Italian version), but on the whole it works rather well.