My condolances to the families and friends and those affected by this horrific event. I still can not believe it myself.
I got this information from the BBC website:
Early warnings
There have been documented malfunctions involving General Electric's CF6 engines - the same model as that of the American Airlines flight - in the past.
Just last month, the FAA called for tougher inspections of possibly worn parts, saying they constituted an "unsafe condition" that could damage an airplane.
The FAA set a 60-day period for industry feedback, which was to end on 4 December.
The NTSB had also warned that failure of these engines during flight could send hot metal fragments tearing through important control systems or fuel lines, and could cause a plane to crash.
The American Airlines plane had gone through routine maintenance tests overnight on Sunday, and investigators were checking who had access to it during those hours.