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David Zalubowski

Low-cost airline Frontier today filed for an initial public offering, which means it likely plans to go public sometime in May. The Denver-based company last year flew 14.9 million passengers through 59 airports in the U.S., Mexico and the Caribbean.

Top line: The Denver-based carrier's income statement reflects its budget sensibilities, with $200 million in net income on $1.7 billion in revenue. This is up from $146 million of earnings on $1.37 billion in revenue in 2015.

Why the improvement? Three factors jump out. First, the average cost of fuel fell from $1.90 per gallon to $1.59 per gallon. Second, the average number of passengers per departure climbed from 154 to 173. then there is "non-ticket revenue" (i.e., booking fees, baggage fees, on-flight purchases), which jumped from $401 million to $726 million.

Market: Airline stocks have been major beneficiaries of the "Trump Bump," judging by the most popular airline ETFs. Budget airline rival Southwest recently hit an all-time high, while Spirit Air remains well below its 2004 highs (but still is up for the past year).

Go deeper

Updated 55 mins ago - Science

This powerful new accelerator looks for keys to the center of atoms

Illustration: Eniola Odetunde/Axios

Nuclear physicists trying to piece together how atoms are built are about to get a powerful new tool.

Why it matters: When the Facility for Rare Isotope Beams begins experiments later this spring, physicists from around the world will use the particle accelerator to better understand the inner workings of atoms that make up all the matter that can be seen in the universe.

Updated 58 mins ago - Politics & Policy

Omicron dashboard

Illustration: Aïda Amer/Axios

  1. Health: FDA OKs antiviral drug remdesivir for non-hospitalized COVID patients — Walensky: CDC language "pivoting" on "fully vaccinated" — Pfizer and Moderna boosters overwhelmingly prevent Omicron hospitalizations, CDC finds.
  2. Vaccines: The case for Operation Warp Speed 2.0 — Teens and adults missed 37 million vaccinations during COVID — Team USA 100% vaccinated against COVID ahead of Beijing Olympics — Kids' COVID vaccination rates are particularly low in rural America — Annual COVID vaccine preferable to boosters, says Pfizer CEO.
  3. Politics: Arizona governor sues Biden administration over COVID funds tied to mandates — Biden concedes U.S. should have done more testing — Arizona says it "will not be intimidated" by Biden on anti-mask school policies.
  4. World: American Airlines flight to London forced to turn around over mask dispute — WHO: COVID health emergency could end this year — Greece imposes vaccine mandate for people 60 and older — Austria approves COVID vaccine mandate for adults — Beijing officials urge COVID-19 "emergency mode" before Winter Olympics.
  5. Variant tracker
1 hour ago - World

UK government: Kremlin has plan "to install pro-Russian leadership" in Ukraine

British Foreign Secretary Elizabeth Truss. Photo: Gints Ivuskans / AFP via Getty Images

The United Kingdom's Foreign Secretary on Saturday night said the government has "information that indicates the Russian Government is looking to install a pro-Russian leader in Kyiv as it considers whether to invade and occupy Ukraine."

Driving the news: U.S. National Security Council spokeswoman Emily Horne called the intelligence "deeply concerning" in a statement to Axios. The Biden administration has said Russia is actively manufacturing a pretext for invasion and warned that Putin could use joint military exercises in Belarus as cover to invade from the north.