Yes, every passenger on a specific aircraft journey between two points shares the same flight number. A flight number (e.g., DL123 or LH400) is a code used by airlines and Air Traffic Control to identify a specific scheduled route and time. For example, if you are flying from New York to London on the 6:00 PM departure, everyone on that physical plane—from First Class to the back of the bus—will have that same number on their boarding pass. However, it is important to distinguish this from the Confirmation Number (PNR) or Ticket Number, which are unique to each individual traveler for billing and identity purposes. Additionally, some flights operate as "Codeshares," meaning you might see two different numbers for the same flight (e.g., a flight operated by United might also have a Lufthansa number); despite the different labels, it is the exact same flight, and all passengers are on the same aircraft together.