Three weeks ago, to the day, I asked when Orbitz would drop its airfare booking fee in response to fee-cutting by Priceline, Hotwire, Travelocity, and Expedia. The answer: Today.

Orbitz has followed suit and has temporarily ended the airfare booking fee, for tickets purchased through May 31, 2009. The fine print: “Valid for round-trip or one-way flights through May 31, 2009. Excludes multi-carrier itineraries and flights originating outside the U.S., Canada, Mexico and the Caribbean.” Too bad about the multi-carrier itineraries. That’s something Orbitz excels at, so perhaps it makes sense that they still charge a premium for it. But still, too bad.

In their press release, they pitch that the combination of the newly-deleted fees and the Price Assurance program (analyzed here and here) makes them the online agency of choice. Assuming that the fares are the same at, say, Orbitz and Expedia, but the only difference was Orbitz’ Price Assurance program, then yes, I’d choose the no-fee Orbitz (even if I’m still a skeptic as to the real worth of Price Assurance).

But regardless: the clock is ticking. May 31 is the same expiration date as Travelocity and Expedia, which is not a huge window of opportunity.

But will they really bring fees back on June 1? I still maintain that, once you and your competitors let the genie out of the bottle, it’s hard to be the first to squeeze it back in. Priceline and Hotwire are unlikely to add the fee back in. Will Orbitz blink? Will Expedia? Travelocity?

I’m still betting that the no-fee environment will be extended. If one agency brings the fee back, expect a marketing blitz by competitors, touting the difference.

In the meantime, consumers benefit.