Delta Air Lines and United Airlines in the past few months re-introduced Saturday-night stay requirements on certain fare types

Like Continental Airlines, . "In certain markets, Saturday night stays seem to be the most effective fence," said Delta chief of network and revenue management Glen Hauenstein. "We have put Saturday night stays on some fares but we have kept the alternative of staying multiple nights at the same time." At United, "We, too, are working very, very hard to segment the market where we can, with minimum stays, Saturday night stays, differential pricing between airports and a number of other tactics," said chief revenue office John Tague.