Travelers at Kuala Lumpur International Airport in Malaysia in March. Photo: Aizuddin Saad/NurPhoto via Getty Images

As air travel increases, many airlines are now offering options for travelers worried about social distancing on packed flights.

The state of play: After previously packing customers onto full flights despite assurances that planes would be sold only to 50% capacity, American Airlines announced Wednesday it will alert travelers about crowded planes before their trips and allow them to switch to other flights.

  • The announcement follows similar measures from United, which alerts customers when flights are 70% full.
  • Delta said it plans to add 100 flights in June so its planes fly no more than 60% full.
  • JetBlue is leaving middle seats open unless families are traveling together on its Airbus planes through July 6.
  • Southwest said it will leave middle seats open on Boeing 737 planes through the end of July.

Why it matters: These are the strongest measures yet put in writing by airlines to help stop the spread of COVID-19 since the pandemic started.

  • Many airlines felt pressure from social media posts showing packed flights and legislators have weighed in seeking official social distancing mandates on planes.
  • Airlines also are trying to cope with massive revenue losses — American plans to reduce its management and support staff by about 30%.
Data: FactSet; Chart: Danielle Alberti/Axios

The intrigue: Airlines have been highly favored by stock traders over the past two weeks, as more begin to anticipate a quick rebound in consumer demand for air travel as cities around the U.S. reopen.

  • JETS, the U.S. global airline ETF, has delivered about four times the S&P 500's return over the past two weeks, though it remains well below year-to-date returns.

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At least 15 states broke their single-day novel coronavirus infection records this week, according to state health department data reviewed by Axios.

The big picture: The number of coronavirus cases increased in the vast majority of states over the last week, and decreased in only two states plus the District of Columbia, Axios' Andrew Withershoop and Caitlin Owens report.

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In photos: America celebrates July 4 during global pandemic

Photo: Francine Orr/Los Angeles Times/Getty Images

The U.S. has already celebrated Easter, graduations and so much more during the coronavirus pandemic, and now it can add July 4 to the list.

The state of play: Axios' Stef Kight writes public parades and fireworks displays around much of the country are being canceled to prevent mass gatherings where the virus could spread. Hot-dog contests and concerts will play to empty stands and virtual audiences — all while American pride treads an all-time low.