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Regulator proposes checks on 453 US-registered jets over seats that may be incorrectly installed.

The US aviation authority has warned that seats on hundreds of Boeing 737 MAX planes could have been installed incorrectly and may require inspection.

The Federal Aviation Administration (FAA) said on Monday that the issue relates to 453 jets registered in the US and proposed requiring airlines to inspect the seats.

If not installed correctly, the seats could come loose during an emergency landing and “injure passengers and crew members”, the FAA said, adding that they could also “block the aisle and slow an evacuation”.

The proposed order would apply only to US-registered planes because the FAA does not regulate foreign airlines.

Regulators in other countries, however, often follow FAA orders when the issue affects aircraft operating in their markets.

A Boeing spokesperson told the Reuters news agency that the company had issued guidance to operators ‌on the matter in December 2025.

“We support the FAA making that guidance mandatory,” the spokesperson said in an email.

The warning adds to years of scrutiny of Boeing’s safety record.

A cabin panel blew off an Alaska Airlines 737 MAX 9 in January 2024, forcing an emergency landing and prompting the FAA to ground 171 jets.

Investigators later found that the panel was missing four key bolts.

The scrutiny intensified after a spate of other accidents around the world, as well as the death of Boeing whistleblower John Barnett in March 2024 while he was providing evidence for a safety lawsuit against the firm.

In June 2025, the US National Transportation Safety Board said Boeing had failed to provide adequate training, guidance and oversight to prevent the Alaska Airlines incident.

There are nearly 2,300 737 MAX jets operating around the world, including 823 in the US, according to aviation advisory and intelligence firm IBA.

The Women’s Tennis Association (WTA) is to require all players to undergo genetic sex testing in order to compete on the WTA Tour.

In the latest edition of its women’s eligibility policy, which will come into effect on Tuesday, players will be required to provide a cheek swab, blood or saliva sample to test for the presence of the SRY gene which is part of the Y chromosome and causes male characteristics to develop.

Players will be tested just once in their lifetime and only a negative result, showing no presence of the gene, will permit them to compete on the Tour.

If they test positive, players will face further medical assessment before being allowed to play.

The new policy also requires players to sign a document that states they could face disciplinary action if they refuse testing.

The WTA’s previous policy, last updated in 2024, allowed transgender women to compete on the Tour if they had lowered their testosterone levels to below 2.5 nmol/L continuously for the previous two years.

There are no known transgender women currently playing on the WTA Tour.

“The WTA’s women’s eligibility policy is designed to promote equal athletic opportunities in women’s professional tennis and maintain fair competition for all players participating in WTA tournaments,” the governing body said.

“Since first being introduced in 1975, the eligibility policy has undergone periodic review in light of developments across international sport.

“Following the most recent review, which included consultation with WTA members and evolving standards across women’s sport, the WTA board approved an updated WTA women’s eligibility policy beginning in 2026 based on biological sex.”

It added: “The WTA recognises that this is a sensitive and complex issue and is committed to treating all players with dignity and implementing the policy in a respectful and thoughtful way.”

The policy change comes a year after World Athletics announced new regulations – brought into effect in September 2025 – requiring athletes wanting to compete in the female category for world ranking competitions to take a one-time gene test.

World Boxing also approved the use of the SRY test in May 2025 when it introduced mandatory sex testing for all athletes wanting to compete in the women’s category.