11.   Some unanswered patterns worry aviation experts, who say that an unsolved crash can come back to haunt investigators.

12.   That crash came amid heavy smoke from forest fires that cut visibility.

13.   That crash came even though the economy was in good shape.

14.   The crash came the following Monday.

15.   The crash comes about two years after another jumbo jet bound from New York to Europe crashed in the Atlantic.

16.   The crash came on a clear and sunny morning just one day and two months after terrorists hijacked two jetliners and slammed them into the World Trade Center.

17.   The crash came just weeks after cracks were discovered in the wings of several aging Concordes.

18.   The crash comes at a period of rising anxiety over both airline safety and terrorist attacks.

19.   The crash comes just days after British Airways grounded a Concorde jet for showing cracks in its wings.

20.   The crash would come amid a flurry of companies reporting discouraging second-quarter profit reports, which has spurred concern that corporate earnings growth has slowed.