What is the primary operational scope regarding route distance for the core provisions of EU Regulation (EU) No 181/2011 on bus passenger rights?

1. It applies exclusively to domestic flights operated by airlines
2. It applies to regular passenger services with a scheduled journey distance of 250 km or more (with certain fundamental non-discrimination and PRM provisions applying to all regular services)
3. It applies only to cross-border trips exceeding 2,500 km
4. It applies exclusively to private taxi and limousine rentals