EngineerFAG2 here.

Engine failure of that kind (particle expulsion) is very rare. Typically at cruising speed (~500 mph) the wind resistance would immediately move all debris aft of the plane. If you look at the pictures in the link below you can see maybe 2 blades missing from the front fan. Most of the damage was to the Kevlar shield as it should be. I want to see a picture of the "shrapnel".

When is the last time you saw something like this???

That is a CFM International CFM56 turbofan. They have been used for decades.

Yes blade failures happen but they are contained in the engine nacelle as designed.

Look into the window impact rating requirement put in place by the FAA.

Hard to believe in such a coincident.

http:// www.dailymail.co.uk/news/article-5626379/Southwest-Airlines-flight-makes-emergency-landing-Philadelphia-engine-blows-out.html