===== Expanded Comparison with Trains Added =====

  - **Boeing 737-800 (Commercial Jet)**
    * V1 speed: ~140 knots
    * Cost per passenger mile: ~$0.07

  - **Airbus A320 (Commercial Jet)**
    * V1 speed: ~130 knots
    * Cost per passenger mile: ~$0.08

  - **Boeing 787-9 (Commercial Jet)**
    * V1 speed: ~150 knots
    * Cost per passenger mile: ~$0.12

  - **Airbus A350 (Commercial Jet)**
    * V1 speed: ~155 knots
    * Cost per passenger mile: ~$0.14

  - **Embraer E175 (Regional Aircraft)**
    * V1 speed: ~120 knots
    * Cost per passenger mile: ~$0.15

  - **Cessna 172 (Light Aircraft)**
    * V1 speed: ~55 knots (takeoff speed, not typically referred to as V1)
    * Cost per passenger mile: ~$0.50

  - **Cessna 208 (Small Aircraft)**
    * V1 speed: ~60 knots (more typical takeoff speed)
    * Cost per passenger mile: ~$0.75

  - **DJI Matrice 300 RTK (Commercial Drone)**
    * V1 speed: N/A (drones don’t typically use V1 speeds)
    * Cost per passenger mile: ~$0.10 (estimate based on commercial drone operations)

  - **Wingcopter 198 (Delivery Drone)**
    * V1 speed: N/A (no direct equivalent V1)
    * Cost per passenger mile: ~$0.15 (estimate for commercial use)

  - **Joby Aviation S4 (Passenger Drone/EVTOL)**
    * V1 speed: N/A (no traditional V1 speed, as it's a VTOL aircraft)
    * Cost per passenger mile: ~$3.00 (estimated based on prototypes)

  - **Lilium Jet (Passenger Drone/EVTOL)**
    * V1 speed: N/A (also a VTOL aircraft)
    * Cost per passenger mile: ~$2.50 (projected cost)

  - **Vertical Aerospace VA-X4 (Passenger Drone/EVTOL)**
    * V1 speed: N/A (VTOL aircraft)
    * Cost per passenger mile: ~$2.00 - $2.50 (projected)

  - **Archer Aviation Maker (Passenger Drone/EVTOL)**
    * V1 speed: N/A (VTOL aircraft)
    * Cost per passenger mile: ~$1.50 - $2.50 (future projected cost)

  - **Helicopter: Bell 206 (Light Helicopter)**
    * V1 speed: N/A (helicopters don’t have a V1 speed; takeoff speeds vary)
    * Cost per passenger mile: ~$3.00 - $5.00 (depending on operation and fuel costs)

  - **Helicopter: Sikorsky S-76 (Medium Helicopter)**
    * V1 speed: N/A (helicopters use different takeoff dynamics)
    * Cost per passenger mile: ~$4.00 - $6.00 (estimate for passenger services)

  - **Helicopter: Airbus H125 (Light Helicopter)**
    * V1 speed: N/A
    * Cost per passenger mile: ~$3.50 - $5.50 (depending on operational costs and load)

  - **Car: Average Car (Personal Sedan, Compact Car)**
    * V1 speed: N/A (cars don’t have a V1 speed)
    * Cost per passenger mile: ~$0.50 - $0.75 (depending on fuel efficiency, maintenance, and other operational costs)

  - **Car: Electric Car (e.g., Tesla Model 3)**
    * V1 speed: N/A (cars don’t have a V1 speed)
    * Cost per passenger mile: ~$0.10 - $0.15 (assuming electricity costs and efficiency)

  - **Car: Ride-Sharing Service (e.g., Uber or Lyft)**
    * V1 speed: N/A
    * Cost per passenger mile: ~$1.00 - $2.00 (based on typical ride-sharing rates, which include factors like driver compensation, platform fees, and vehicle maintenance)

  - **Train: High-Speed Rail (e.g., Shinkansen in Japan, TGV in France)**
    * V1 speed: N/A (trains don’t have a V1 speed)
    * Cost per passenger mile: ~$0.10 - $0.20 (depending on route, country, and operational model)

  - **Train: Regional Rail (e.g., Amtrak, Commuter Trains)**
    * V1 speed: N/A
    * Cost per passenger mile: ~$0.15 - $0.25 (depending on country and system)

==== Key Considerations for Trains ====

  * **High-Speed Rail:**
    - Trains like the Shinkansen (Japan), TGV (France), and other high-speed rail systems provide highly efficient transportation with low cost per passenger mile. The cost per passenger mile for high-speed rail is typically around $0.10 - $0.20.
    - These systems are most cost-effective when running at full capacity and can transport large numbers of passengers over longer distances.

  * **Regional Rail:**
    - Commuter and regional trains (like Amtrak or various national/regional systems) generally have a cost per passenger mile in the range of $0.15 - $0.25.
    - These trains are often used for daily commuting and short-distance travel, offering significant capacity but at slightly higher costs compared to high-speed options.

==== Summary of Transportation Costs (Updated) ====

  * Cars (personal and electric) remain one of the lowest-cost options, with electric vehicles like the Tesla Model 3 providing the cheapest travel at $0.10 - $0.15 per mile.
  * Trains (both high-speed and regional) offer competitive or slightly higher costs depending on the region, with high-speed rail as the most affordable for long-distance travel at $0.10 - $0.20 per mile.
  * Helicopters, UAM vehicles (like drones), and aircraft generally have higher operational costs per mile, particularly for smaller aircraft, helicopters, and new UAM technologies like eVTOLs and passenger drones.