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+1 I flew Calgary to Narita on a 787. It felt like a 3h domestic flight.

For another data point, I just completed a flight on a United 787 from SFO to Seoul (12-13 hours) - that was a rough flight, almost as bad as my flights from SFO to Haneda (I puked on or from both flights to Haneda), and I had a wicked headache after landing.

I wonder if I have some pressure sensitivity that affects me on these long haul flights, as I haven’t felt it on domestic flights or flights from SFO to Heathrow (or back). In addition, I know I am susceptible to altitude sickness.

Sinus issues that may be small enough not to be noticeable normally can become very noticeable with the pressure difference. Aftermath (or the start of) a cold that you don't notice can be enough. Nausea can be affected by anything that impacts the inner ear, so sinus pressure etc. can have an effect.

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