It could be just a business decision, but I wonder if President Trump had anything to do with this.
perhaps making sure no chinese planes in the air should ‘something kick off’??
A previous article that I saw went out of their way to claim it had nothing to do with Trump's successful trip to Asia.
I wondered that, too. It is strangely coincidental that ceasing to sell tickets for 2018 flights coincides with the US getting serious about sanctions. If sanctions caused it, you have to wonder why flights started the year Obama was elected and ended the year Trump took office.
Frankly, I don’t think there is any coincidence in the dates, nor do I doubt that Obama favored North Korea getting nuclear weapons. (As did Hillary and Kerry.)