We here at TPG love a solid loophole, and that’s what Skiplagged is all about. The app finds the cheapest fares by digging into what’s called “hidden city ticketing.” This means that sometimes booking a flight beyond your chosen destination is cheaper and your desired destination is simply a stop along the way. For example, if your flight from New York to Atlanta is coming up super expensive, Skiplagged may find a flight for half the price where the final destination is Fort Lauderdale, but Atlanta is a stop on the way. Clearly, some may consider this a grey area, and the airlines sure do. That’s why United sued Skiplagged, but Skiplagged won, so the app continues on! Keep in mind that you may have to make sacrifices for getting these cheaper fares, like not checking a bag (because it will end up at the final destination, not your desired one). This app is free to download.
A couple of things bother me though. First, the little hyperactive chipmunk is annoying at times. Then, the information on the graphic results is not immediately comprehended. Only after clicking around the screen, I could decipher the different symbols and colors that identified the flights. There is definitely a learning curve to take advantage of all the features in this app which I don’t think it should exist.
If the flight is relatively empty, your chances are slim. Even though seats in business class may also be empty, the airlines don’t usually upgrade people for no reason. If the flight is full, your chances are better. Airlines carefully plan how much they oversell flights, and their inventory departments are not upset if people need to be upgraded to accommodate everybody on the flight. Therefore, on a full flight the airlines sometimes are forced to upgrade people. In this scenario, if you have a good story, you may be lucky. Remember, of course, that business or first class may already be full from prebooked elite-level upgrades.
The FareIQ feature is unique amongst all tracking websites in that it will also track your flight after purchase and send a notification if the price drops, as you could be entitled to a refund from airlines that will refund the difference when the price drops. It pays to know the refund policy of each carrier in this case, as that could be the difference between getting a refund or not.
Hopper’s signature rabbit may seem a bit childish at first, but this bunny knows its stuff. The flexibility feature is especially useful: put in your home city and desired destination and Hopper will map out the entire year for you with color-coded prices. The dates are shown as month-long calendars, with colored boxes telling you when prices fall into certain categories, like less than $300 or +$500. The app-only service also predicts whether or not the price for your chosen dates may drop or not (they monitor up to 15 billion flight prices per day) and allows you to “Watch the Trip” —  a feature where Hopper will send you alerts if the price changes. If you know you need a vacation, but are flexible on your destination or dates, you can also set alerts for the app to tell you when there are destinations deals. This app is free to download. 
Upgrade Bid upgrades can only be applied once to the next higher class. Upgrades to Business Class are only available for Premium Economy Class passengers. However, for aircraft or routes without Premium Economy Class, you would be invited to upgrade from Economy Class to Business Class. No further upgrade by cash or miles will be honoured after an Upgrade Bid upgrade has been offered.
The booking procedure on Cleartrip is quite simple. Select the date of journey, specify Journey From and Journey To details and number of people. As soon as you feed in this data, you will be able to see the list of all the available flights for that date. Accordingly, you can click the Book Now button against the flight you choose. Next, you need to make the payment and book the ticket. Soon you will get a booking confirmation on your email/mobile.The tickets you book with us are additionally governed by the terms and conditions of respective airlines. The total price displayed on the tickets is inclusive of the government charges, and there are no hidden charges. 

Airfarewatchdog.com: This is the only site in the group that lists and compares fares on Southwest Airlines (now the largest domestic carrier based on passengers boarded, but one that refuses to pay sites to send it traffic), as well as those on low cost carriers such as Allegiant and Skybus, which sell fares only on their own Web sites. Whereas the other sites listed here use computer programs to evaluate fares, Airfarewatchdog uses people, who actually test if seats are available at the fares listed (sometimes airlines file fares for which very few or no seats at all are available, which is very naughty of them).
ITA Software Classic Matrix Tool - This tool allows you to search for fares in different sales cities so that you can accurately plan purchases in any city around the world. Additionally it has an undocumented feature that allows you to specify specific fare buckets. If you want to, for instance, search for A bucket availability on the HKG-JFK route on Cathay Pacific you would enter the search as From: HKG:: cx+ / f bc=a and To: JFK:: cx+ / f bc=a. You can substitute the "cx" with the proper airline code for the airline you wish to check, and substitute the "bc=a" with "bc=X" where X is the fare bucket you wish to check. If you wish to check multiple booking-codes and not place any restriction on the airline format the request as JFK::/ f bc=x|bc=y|bc=z to check the x, y, and z buckets. Another undocumented feature is the ability to request multiple segments on specific carriers (useful for mileage runs). If you want to travel from Los Angeles to New York and take 4 American Airlines segments, you would enter the departure city as LAX::AA AA AA AA and the destination city as JFK::AA AA AA AA. This will search for a 4 segment connection in each direction on AA. You can also force connections in specific cities. So, for instance, if you wanted to connect in STL from LAX to JFK on American Airlines you would enter the departure city as LAX::AA STL AA and the destination city as JFK::AA STL AA You can find the syntax by clicking "advanced routing codes" and then clicking on the little question mark next to the routing codes box. There is also a useful discussion of how to use this tool to the fullest on Flyertalk. 
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