Timeline: 12 aviation mysteries

• Electrician finds home wired to explode during inspection
• Toddler served alcohol because of 'human error,' restaurant says
• Air Force Katrina rescuer looking for girl he saved in 2005
• Huge numbers of sharks migrating near south Florida shores
• Restaurant worker's act of kindness pays off in big way

Sadly, the crash of Germanwings Flight 9525 is just the latest of many aviation mysteries. Here's a look at some other aircraft disasters.