What equation is used to determine the new destination for passengers who wish to travel beyond their ticketed destination?

The equation that reflects how to identify the new destination for passengers wishing to travel beyond their ticketed destination effectively describes the journey they are making, highlighting the transition from the original destination to the new destination. This formulation illustrates the complete route being taken, emphasizing that passengers are moving from one defined endpoint to another.

Using this approach is important in logistics, fares calculation, ticketing, and understanding customer travel patterns. The other options suggest mathematical operations that are not relevant to the context of determining a new travel route; they imply either subtraction or addition of destination points without accounting for the journey concept or the need for clarity in understanding passenger travel intentions. Option D encapsulates the essence of travel plans by connecting the origin and destination appropriately, making it the most suitable choice for expressing how passengers can extend their travel after their initial booking.