They often know the market well and can predict when
If you have to be at your destination by a particular time, be careful about waiting too close to your departure time before purchasing your ticket. If you do not have your seat reserved a week before you need to be there you run the risk of not being able to get a flight. This is especially true of flights to popular destinations and during peak travel season.
In Google Chrome or Safari, incognito is enabled by hitting Command (or “Control” if using PC), Shift, “N”. For Mozilla Firefox or Internet Explorer, hit Command (or “Control” if using a PC), Shift, “P”. This will open a new browser window where your information is not tracked, thus not inflating prices as you search. Note: if you're using an older version of OS X, open Safari then click “Safari” in the menu bar, and select “Private Browsing”.