Fueling manager Jarid Svraka looks on as he fuels an Alaska Airlines Boeing 737-800 jet. Photo: Elaine Thompson / AP

For the seventh year in a row, Alaska Airlines was the most fuel-efficient airline among U.S. carriers, according to a study from the International Council on Clean Transportation (ICCT).

Why it matters: Naya Olmer, the study's author, said Alaska Airlines "burns about 13% less fuel than the industry average, it's a profitable airline, and it's done this for seven years running...So, it's possible." The report also notes that aviation accounts for around 2.5% of global CO2 emissions, and U.S. carriers make up 30% of that.

  • But, but, but: As U.S. carriers saw a 10% spike in overall revenue passenger miles between 2014 and 2016, energy effienciy fell by the wayside and CO2 emissions jumped by 7%.
  • The other leaders in fuel-efficiency include Frontier and Spirit, which use "cleaner fleets, higher load factors, denser seating configuartions," and more.
  • Virgin America was the least fuel-efficient U.S. carrier in 2016; Jet Blue came second-to-last.

One more thing: Alaska Airlines bought Virgin American last year. Dan Rutherford, aviation director at the ICCT, told Axios that "a back-of-the-envelope suggests that Alaska would have lost its fuel efficiency advantage over Frontier, Spirit, and Southwest in 2016 if the merger had gone ahead then. But Alaska's future efficiency will depend on how it actually operates Virgin's leased A320s, and also for how long."

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Tropical Storm Zeta is expected to strengthen back into a hurricane and bring dangerous storm surge conditions to parts of the northern Gulf Coast on Wednesday, per the National Hurricane Center.

The state of play: Louisiana Gov. John Bel Edwards (D) requested a pre-landfall Federal Declaration of Emergency in a letter to President Trump on Tuesday, ahead of the storm's expected arrival south of New Orleans.

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A screenshot of the Trump campaign website after it was hacked.

The Trump campaign website briefly went down and its "About" page was modified after hackers attacked the site Tuesday evening.

The big picture: With just seven days before the election, the hackers emulated the FBI and declared on the "About" page that: "this was seized. the world has had enough of the fake-news spreaded [sic] daily by president donald j trump. it is time to allow the world to know truth." Two addresses linked to the cryptocurrency Monero appeared on the site. Trump campaign spokesperson Tim Murtaugh in a statement said no sensitive data had been exposed in the attack.

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