Many frequent travelers swear by ExpertFlyer, which lets you see the availability of each booking class, including some award seat booking classes. It’s a useful tool, but it’s not free.

Enter SeatCounter.

Admittedly, SeatCounter doesn’t have all the features of ExpertFlyer, such as actual fare rule information, but it DOES offer an overview of how many tickets are available for sale in each booking class. You don’t get price information, but you can see how many seats are actually for sale in each fare booking code.

For those looking to grab frequent flyer award seats or check the availability of upgrades, this is a particularly helpful site. You just need to know the letter to look for. That varies by airline, but SeatCounter offers some keys at the bottom of their results pages.

Tip: If you’re looking for a single airline’s availability, especially if looking for award seats, enter that airline’s two letter code TWICE in the “favorite airlines” boxes.