Some airlines have tracked individual queries based off of logins, or more generically, cookies.
http://www.bitterwallet.com/save-money-on-ryanair-fares-by-deleting-your-cookies/42133

I couldn't speak for the airlines you mentioned, but it would be within their technical capabilities.

I use the ITA matrix to perform more anonymous searches, especially when frequently checking fares. ITA wants to sell you the lowest priced ticket, so they are neutral.

Other posters suggest that your query is drowned out in the volume, which is true if fully anonymised, but probably not true if you log in/don't clear your browser cookies.

Beyond that, fares are a complete mystery to me, although I did have a positive experience with Fare Lock on united.com. Saved $160 for two passengers (5% of the price) by using the 7 day Fare Lock.