(I’m clearly rewatching YOI because what else am I going to do until Level 2?)
This line from Victor implies that he pretty much always flies first-class. So, why wouldn’t he just buy another first-class ticket for Yuuri so that they can sit together?
Likely because Yuuri, being the anxious bean that he is, doesn’t want to deviate from routine. As an anxious person, I also don’t like to change my environment if I can help it, especially before a big event. So Yuuri will stick with sitting in coach because that’s a familiar setting where he’s most comfortable.
And Victor will sacrifice a first-class seat just to sit with Yuuri for the whole flight.
I love all these details.