TxAgKuwait, the wazoo is in Gray's Anatomy, they just use a different word for it. :+)
The Delta fares and restriction changes do not seem to me predatory. As you noted, Tx, companies are cutting way back on full-fare travel and thus yields at the Six Families are dropping badly. Delta is merely trying to get some wazoos warming those seats, so they get some revenue. On the KCI-IAD route, for instance, they don't even have low-fare competition.
Once again we see that the Six Families' high-cost, high-fare general business strategy puts them at economic risk. They are addicted to $800-$1500 full fares on coach domestic routes in order to feed their excessively high cost structures, and when the economy softens businesses tell them where they can stick those fares (see Gray's Anatomy ;+) ). Business tolerated high fares during the boom times of the '90s, but not now.
Airline travel is about getting people places. Bottom line. In a free market, people will seek the lowest fare unless they have money to burn as business did in the late '90s. The airlines and their unions are about to get a fresh lesson in this truth. From the look of the Comair settlement, ALPA's freewheeling blackmail days are over. Expect UA and DL to be pleading for concessions within a year or two, because they won't be able to pay for their blackmail pilot contracts.
If the Mafia Cartel does use the soft economy as an excuse to turn predatory on the low-fares and shut down the free market, expect Congress to intervene. The threat of profit-killing and yield-management-snarling re-regulation should be enough to make the thugs behave.
Need a new airline paint scheme? Better call Saul! (Bass that is)