The USS Constitution, the oldest commissioned ship afloat in the Navy — it was launched in 1797 and earned its nickname “Old Ironsides” in the War of 1812 — is in the midst of a three-year restoration at Dry Dock 1 at the Charlestown Navy Yard.

Craig F. Walker/Globe Staff

The USS Constitution, the oldest commissioned ship afloat in the Navy — it was launched in 1797 and earned its nickname “Old Ironsides” in the War of 1812 — is in the midst of a three-year restoration at Dry Dock 1 at the Charlestown Navy Yard.

Skilled workers relish chance to restore USS Constitution

Forty workers are undergoing a three-year, painstaking restoration of the world’s oldest commissioned warship at the Charlestown Navy Yard. By Karishma Mehrotra

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Latest Business headlines

Transportation

US airline inquiry would need proof beyond business as usual

As the Justice Department launches an investigation into possible collusion in the airline industry, experts say the government faces the burden of proving that carriers were deliberately signaling business decisions to each other.

Markets

China stocks extend rout as world markets slump

China’s main stock benchmark plunged as much as 7 percent Friday as government stabilizing measures failed to reassure panicky investors while other Asian indexes fell ahead of Greece’s weekend austerity referendum.

Insurance

Aetna to buy Humana as health insurer landscape shifts

Aetna, based in Hartford, aims to spend about $35 billion to buy rival Humana and become the latest health insurer bulking up on government business as the industry adjusts to the federal health care overhaul.

Media

Reddit moderators shut down parts of site over employee’s dismissal

Hundreds of sections of Reddit, the popular online message board, were down early Friday in what appeared to be a protest by many of the site’s moderators after the abrupt dismissal of a high-ranking company employee.

Finance

Accounting exec earned leniency in Madoff case, prosecutors say

Prosecutors say a 79-year-old former New York accounting firm executive who did work for some of Bernard Madoff’s most important longtime clients has earned leniency by cooperating.

Uber suspends low-cost service in France amid legal pressure

Uber is hoping to defuse an escalating legal dispute and sometimes-violent tensions with traditional French taxi drivers.

Aetna-Humana adds to takeover frenzy among US health insurers

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World stocks drift lower ahead of Greek vote

China’s main stock benchmark plunged as government efforts failed to reassure panicky investors.

Shirley Leung

Leung writes a business column every Wednesday and Friday. Previously she served six years as the business editor overseeing daily and Sunday coverage.