As of Monday morning, even Delta had rescinded the $5 one-way increase, which failed to gain traction among enough airlines to overcome competitive pressures.

Airlines, struggling to offset historically high fuel prices, have raised fares several times in the last year. Experts now say that trend may be coming to a close.

"This represents the second failure out of three broad-based attempts this year, though failures are reasonably common,'' said JP Morgan airline analyst Jamie Baker in a research note.

"That said, the relevance and likelihood of future increases is increasingly debatable, in our view,'' Baker wrote.

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