Update: this popular deal may have sold out. See more deals >
The little-known Porter Airlines, who service destinations in Canada and the northeast of the US, have posted a promotional code that can save you up to 50 percent on the original price of a fare.
To redeem this discount, you simply need to book your flights on the Porter home page, and enter the text BIG (all caps, no spaces) in the promotional code box.
Note that the exact amount saved varies from route to route, with a maximum discount of 50 percent available. Sale fares are good for travel between now and September 4, and the promotional code can be used until the end of tomorrow (March 9).