Travelocity gives you the booking code and fare basis code. From their flexible dates search page, you can click on "Rules" to the right on the list of fares. For specific dates once you've selected your specific flights, and told them you don't want a hotel, the "Review the price and restrictions for your trip" screen comes up, and there's a link to "Adult Fare Rules" on the right. The rules popup has the fare basis and booking code.

Interesting caveat with Travelocity "dates flexible" search: Since they "upgraded" the software engine for the fixed-dates search, the flexible dates option doesn't work from the main www.travelocity.com page. To get flexible search to work, mouseover the blue "Flights" dropdown at the top of the screen and choose "search flights". The screen it takes you to looks almost identical to the main homepage, but the flexible dates/fare listing works then. ^