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Another accidentalanecdotal story to contribute to other answers - my mother was taking a transatlantic flight a couple of years ago, and the departure was delayed for whatever reason.

She was flying Air Canada to Toronto, the scheduled flight was ~10 hours, and the delay was 4 hours. Apparently, in Canada it is forbidden for a pilot to stay on the job for more than 12 hours. They landed in Nova Scotia, and there was a replacement crew waiting for them there.

So its not just winds and fuel, its also the labor laws that can contribute to that as well.

Another accidental story to contribute to other answers - my mother was taking a transatlantic flight a couple of years ago, and the departure was delayed for whatever reason.

She was flying Air Canada to Toronto, the scheduled flight was ~10 hours, and the delay was 4 hours. Apparently, in Canada it is forbidden for a pilot to stay on the job for more than 12 hours. They landed in Nova Scotia, and there was a replacement crew waiting for them there.

So its not just winds and fuel, its also the labor laws that can contribute to that as well.

Another anecdotal story to contribute to other answers - my mother was taking a transatlantic flight a couple of years ago, and the departure was delayed for whatever reason.

She was flying Air Canada to Toronto, the scheduled flight was ~10 hours, and the delay was 4 hours. Apparently, in Canada it is forbidden for a pilot to stay on the job for more than 12 hours. They landed in Nova Scotia, and there was a replacement crew waiting for them there.

So its not just winds and fuel, its also the labor laws that can contribute to that as well.

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source | link

Another accidental story to contribute to other answers - my mother was taking a transatlantic flight a couple of years ago, and the departure was delayed for whatever reason.

She was flying Air Canada to Toronto, the scheduled flight was ~10 hours, and the delay was 4 hours. Apparently, in Canada it is forbidden for a pilot to stay on the job for more than 12 hours. They landed in Nova Scotia, and there was a replacement crew waiting for them there.

So its not just winds and fuel, its also the labor laws that can contribute to that as well.