Deutsche Bank analyst Michael Linenberg downgraded Delta Air Lines (DAL) to Hold saying several economic indicators suggest a more challenging environment for 2016. The slowdown in U.S. corporate profits could lead to reduced demand for corporate travel, Linenberg tells investors in a research note. He lowered his price target for the shares to $55 from $68. Delta closed yesterday down 65c to $48.68. The analyst this morning also downgraded American Airlines (AAL), United Continental (UAL) and Hawaiian Holdings (HA) to Hold. Linenberg favors domestic airlines that are less reliant on corporate travel, namely Southwest (LUV), Alaska Air (ALK), JetBlue (JBLU), Spirit Airlines (SAVE) and SkyWest (SKYW).

JPMorgan upgraded JetBlue (JBLU) to Neutral from Underweight with a $7 price target. The company is increasingly well-positioned for a modest potential move to the upside based on improving market sentiment, and its upcoming Q2 guide coming next week may exceed consensus, the analyst tells investors in a research note. JetBlue is the second least-liked airline based on sell-side ratings, after Spirit (SAVE), with short interest on the stock also remaining "stubbornly high", the firm added.

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Notable companies reporting before tomorrow's open, with earnings consensus, include Blackstone (BX), consensus 96c... Elevance Health (ELV), consensus $10.53... D.R. Horton (DHI), consensus $3.06... Genuine Parts (GPC), consensus $2.16... Snap-on (SNA), consensus $4.64... Keycorp (KEY), consensus 22c... Ally Financial (ALLY), consensus 33c... Alaska Air (ALK), consensus ($1.05).

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After experiencing problems with a computer system upgrade, Alaska Airlines grounded its entire U.S. fleet Wednesday morning, NBC News' Rob Wile and Jay Blackman report. An issue arose "while performing an upgrade to the system that calculates our weight and balance," the carrier said in a statement. The FAA approved a ground stop for all Alaska and Horizon flights starting at approximately 10:50 a.m. ET. Reference Link

Says without approximately $200M impact Boeing (BA) 737 MAX 9 from grounding, United (UAL) would have reported a quarterly profit.

Seaport Research raised the firm's price target on United Airlines to $66 from $60 and keeps a Buy rating on the shares. The company reported Q1 results that "handily bettered consensus," the analyst tells investors. The firm notes no change has been made to its thesis made in January, but notes consensus for the year has to move higher.

Check out this morning's top movers from around Wall Street, compiled by The Fly.  HIGHER - Alcoa (AA)... To see the rest of the story go to thefly.com. See Story Here