ID say the main difference is the flight will end up costing you a hell of allot more when you look back in 5 years. Airlines in Korea are accepting crypto though! South Korea in general has amazing infrastructure to use your crypto in general. They are being very proactive
Looking back 5 years I'm glad I made the decision to make bitcoin my primary currency and only sell for fiat when I needed to.
So every time I paid for anything with bitcoins meant that I didn't have to hold fiat on the off chance that I was going to need to spend it.