Post 9/11, many parents do. Here's why.

Actress Kate Winslet and her husband director Sam Mendes fly on separate planes when traveling without the kids. The couple have agreed never to fly together, to ensure that their son Joe and Winslet's daughter from her first marriage Mia are never left without both parents.

Mendes was booked on one of the flights hijacked by the 9/11 terrorists, according a friend quoted by a newspaper, but missed his flight. Winslet was on a British Airways flight from London to Dallas when a man stood up on the plane and shouted that he was a terrorist and they were all going to die. The man was arrested after the plane landed.

A spokesman for the pair told the Daily Mail on Sunday: "Where possible, Kate and Sam do prefer to travel in separate planes."

After 9/11, mom Traci vowed to never fly with her husband for the same reason. "We flew to New York, and I took one plane, he took another, " she says. "If something happened, I wouldn't want us both to be on the same plane and our kids to be orphans."

Some might say these parents are being paranoid ... after all, a car is much more dangerous than a plane, and husbands and wives drive together without the kids all the time. But if we had missed a hijacked plane on 9/11, we would be overly cautious, too.

Do you and your husband fly separately?

Kate Winslet	Remembering 9/11