Interesting comment re lost French passenger aircraft:

Ocean search for Air France jet with 228 aboard continues

[…]

No distress signal was received and aviation experts said they did not have enough information to understand how flight AF 447 could have disappeared without a trace.

“All scenarios have to be envisaged,” said French Defense Minister Herve Morin on Europe 1 radio.

“We can’t rule out a terrorist act since terrorism is the main threat to Western democracies, but at this time we don’t have any element whatsoever indicating that such an act could have caused this accident,” Morin added. […]

Two interesting points:

Is terrorism the main threat to the West?

Disappearing without a trace… starting to sound strange. If nothing is found, bet this becomes a movie.