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.
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.
This is a much debated topic! Our latest Twitter poll revealed that 86% of British travellers don’t know when they should be booking their flights to bag the best deals. By creating Price Alerts, you’ll be able to check the price of your chosen flight, and book when the flight ticket is the lowest. In general, you should be looking to book your flight no later than seven weeks before you want to jet off. However, the exact time frame does differ according to your chosen destination. To get exact timings on when to book the cheapest flights, try our The Best Time To Book tool.
Airfarewatchdog – You can set up regular price alerts for favorite routes, but the real appeal for cheapskates with wanderlust is this site’s Top 50 Fares of the Day page. This tracks bargain airfares from Frontier, JetBlue, and other carriers prone to slash prices, as well as larger airlines. (Sample deal from earlier Wednesday: $40 for a roundtrip flight from Pittsburgh to Las Vegas). 

Travel requires that you keep yourself updated with the latest flights status. Often, you would need to check the flights schedule of the airlines for a particular sector while planning your travel. In the age of internet, you can check the flights status and do the bookings far easily than ever before. Instead of running to the travel agent office or making frequent calls, you can get online with Yatra.com which provides an easy online interface to check out which all airlines are operating flights at what all times in a particular sector. We comprehensively cover more than 550 sectors within India, providing the latest sector-based flights information about the airlines operating in the area.

If I want to use American miles to book a flight on Air Tahiti Nui — a partner some AA agents aren’t aware of — I’ll look up the flight availability on ExpertFlyer first. Once I find an available seat, I’ll call and ask an American agent for the specific flight and fare class I see on ExpertFlyer. If they cannot locate it, I’ll even use the airline’s two-character IATA code to help the agent find the flight I’m trying to book with miles (if you don’t know this code, see below; it’s included in the ExpertFlyer results).
If you’re looking for a specific flight on a specific date, Flight Fishing may not be for you. If you’re a bit more adventurous, you may score an exciting airfare. Registering on Flight Fishing allows you to set up a deal alert that could be as specific as one airport to another, from a specific airport to a region, or as general as from your preferred airport to anywhere.
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. 
Within Momondo’s flight results, there are tabs across the top of the screen that let you move between the cheapest flight, quickest flight time as well as options for ‘early out’ and ‘late in’.  The results are extremely easy to read and feature all the information you need at a quick glance, including the carrier logo and total transit time. When you click on one of the them, you are quickly forwarded to the airline’s website.
The other nice thing about the results page is that it’ll show you connecting options (as long as you don’t limit it to nonstop flights at the outset), though bear in mind that every leg of a one- or multi-stop itinerary must have award availability in the desired class of service in order to book the entire trip with miles. Remember too that most award seat availability shown on ExpertFlyer will be at the saver level for all programs. This is nice in that it should be bookable using any partner program’s currency, but it won’t show you the expanded award inventory that’s sometimes available through certain programs.

Extra seat: empty middle seat (valid for the transport of musical instruments larger than a guitar)   Extra ticket (same price as existing ticket if booked by midnight on the same day; otherwise the flight fare on the day the private seat is booked) Extra ticket (same price as existing ticket if booked by midnight on the same day; otherwise the flight fare on the day the private seat is booked)
When requesting an eUpgrade to Business Class, you will always be offered the option to sit in the best available seat. For instance, if you originally requested an eUpgrade to Business Class, but there are no Business Class seats available at flight departure, and seats in Premium Economy are available, you will be offered a seat in Premium Economy. The eUpgrade requirements will naturally be adjusted accordingly.
The best time to check in with airports is typically around 24 hours before your departure. You can also sign up for flight alerts, which allow you to program your flight or preferred flight for an upgrade. The alert will automatically search for open availability and let you know as soon as it’s open, giving you the best chance to scoot on up to the front. 
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