Here are the nitty gritty details. These bargain fares are offered only on the internet. The deals change every week, and most air carriers don't post the bargain rates until a Wednesday just prior to the weekend for which they're available. Other caveats are that you sometimes must travel only on certain days of the week. Each carrier has slightly different rules so when you access their web page to check on this, please read their fine print carefully.
Some air carriers post their bargains directly on their web page.
Others require you to get on their internet mailing list and will send you the deals each Wednesday via email. Now, most travel agents are not going to know about these bargains at this time. Also, if you call the airlines at their regular telephone numbers, their people may not know anything about these Internet bargain fares. You usually must make your reservations on the individual air carrier's web page, or call the special Internet reservation telephone number they give you on their web page. Below are the major carriers presently offering Internet specials.