Citation: http://www.straitstimes.com/breaking-news/world/story/american-airlines-cancels-all-us-flights-several-hours-20130417
This is one of my concerns, when I go abroad. Fortunately, I've never experienced cancellation of my flights. But, there can be cancellation of my flights in the future.
Especially, when cancellation forced me to stay one more day at an airport, I have to book a hotel myself. Then, I must have enough English communication skills to book the hotel.