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Delta Air Lines Inc. (DAL) - Get Delta Air Lines, Inc. Report beat earnings estimates on Wednesday, Oct. 11, and cheered Wall Street with its strong current quarter guidance and its shares rose -- but only by 37 cents or 0.70%.

With Delta the first carrier to report third-quarter results and to issue fourth-quarter guidance, the market's reaction provided an indication that a recovery in the airline sector is well underway.

Now, investors will wait to see if the pattern will be broken by results from often surprising United Continental Holdings Inc. (UAL) - Get United Airlines Holdings, Inc. Report , which reports Oct. 18, or from Spirit Airlines Inc. (SAVE) - Get Spirit Airlines, Inc. Report , which reports Oct. 26.

Sprit wrecked the party with its earnings call in July, when executives said industry fare cutting was widespread. In response, airline shares tumbled. The Standard & Poor's Airline Index, which hit its all-time high of 434 on July 7, fell 20% to 347 on Aug. 24.

But now the index has largely recovered: It closed Wednesday at 401.

Since the first week of September, airline shares have rallied between 9% (for Spirit) and 21% (for American Airlines Group Inc. (AAL) - Get American Airlines Group, Inc. Report ).

Delta guided towards fourth-quarter passenger revenue per available seat mile between 2% and 4% and said unit revenue would be positive in all four global regions: domestic, Atlantic, Pacific and Latin America.

In a report issued Wednesday, JPMorgan analyst Jamie Baker wrote, "Delta provided an impressive 4Q PRASM guide, in our view.

"We consider the magnitude of the PRASM guide sufficient to extend the sector's current rally, at least until the next potentially RASM guide calls Delta's into question (which has happened in the past.)," Baker wrote.

"With the reporting calendar clear for another five market days, we see little to arrest the sector's newfound momentum in the immediate term," he said. "We expect the sector rally to continue."

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In a report issued Thursday, Oct. 12, Buckingham Research analyst Dan McKenzie wrote, "On its earnings call, Delta highlighted strengthening yields throughout 3Q17 and their view that they can successfully grow and execute on positive RASM."

Southwest Airlines Co. (LUV) - Get Southwest Airlines Co. Report , American and United will "likely guide to a revenue outlook that's stronger vs. our base outlook (on Transatlantic, [Latin America] strength ex-Caribbean and even domestic)," McKenzie wrote. "If correct, [that] likely pushes those stocks (and Delta) higher."

The strongest airline stock on Wednesday was JetBlue Airways Corp. (JBLU) - Get JetBlue Airways Corporation Report  , which gained 1.5% after reporting on the impact of hurricanes Irma and Maria.

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JetBlue said third-quarter RASM increased by 0.9%, which apparently fueled the share price increase. The increase "is above the midpoint of the prior guidance range of [minus] 1% to 1%," wrote Cowen & Co. analyst Helane Becker.

The carrier said the hurricanes would have minimal impact in 2018. McKenzie said short-sellers covered their positions in response, explaining the share price gain.

JetBlue said the hurricanes will reduce operating income by $30 million to $35 million in the third quarter and by $50 million to $70 million in the fourth quarter. Fourth-quarter capacity growth will be approximately 3% lower than planned due to reduced Caribbean flying, and RASM growth will be negatively impacted between 1% and 2%.

Becker said that while the hurricane impact was clarified, questions remain. "Our biggest concern is lingering negative effects related to the hurricanes and a potential negative impact of redeployed aircraft into other markets, she wrote. She has a market perform rating and a $22 target price. Shares closed Wednesday at $20.53. JetBlue will report earnings on Oct. 24.

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This article is commentary by an independent contributor. At the time of publication, the author held no positions in the stocks mentioned.