Travelocity.com: Travelocity, as far as we know, was the first travel agency site to offer a fare watch system. Once upon a time, it tracked both international and domestic fares, but now only covers domestic/Canadian deals. To use it, go to the "Flights" tab and then to "Low Fare Alert" and then click on "Get email alerts" in the upper righthand corner under "Tools". You can sign up for alerts on up to five routes. On the Low Fare Alert page you'll also see a list of fares, from any given city, that have gone down in price from the previous day. Travelocity searches fares just once a day, however, compared to Farecompare's three times a day Monday-Friday.
David Rowell, who writes The Travel Insider, notes that “it is enormously harder to get upgrades these days than it used to be. Well, correction, it is harder to get undeserved upgrades these days. The procedure for getting upgrades that one is entitled to has become almost 100 percent automatic and hands-off, and with all flights being full in both cabins, there isn’t much ‘wiggle room’ for people to exploit.”
The first upgrade tip is to consider using your accumulated miles for flight upgrades as far in advance as possible (flights are often posted up to 330 days prior to scheduled departure). Even this far out the airlines will usually make available at least a couple of seats for mileage upgrades but not for awards. This is important to understand. Consider purchasing an inexpensive coach ticket and use your miles to upgrade. An additional benefit to doing this is you will earn qualified miles for the paid coach ticket (you receive zero credit on a Premium seat using miles exclusively). If you want or need to use your awards miles for securing a ticket (without an actual ticket purchase), you should follow the same rules of checking the availability as far out as possible.
If you don't have access to a service such as Flight Alerts, check in with the airlines 24 hours prior to departure. If an upgrade is still unavailable at this point, check in online at the airline's Web site. Most airlines establish a waitlist for upgrades at the airport. Priority is usually given to those who have checked-in the earliest and with online check-in available 24 hours prior to departure; this will greatly increase your chances of getting that elusive upgrade.
Certainly it wasn’t all chance that brought first-class upgrades floating one’s way, and a heavy battery of hard and soft tactics arose to increase your chances. Dress neatly, speak politely, fly the same airline regularly, inquire when offering your frequent flier number to the telephone booking person, stand a little taller at check-in if you can (for the tall-person sympathy upgrade), volunteer to give up your economy seat so a family might sit together, volunteer to be bumped on an overbooked flight.