So if we don’t get to our destination as per our PAID TICKET we don’t have ground to sue? My money is on the Dr.
Yes you have grounds to sue them for not honoring their end of the bargain.
What you don’t have is the right to physically force them to fly you to your destination.
If they decline to transport you to your destination and tell you to get off of their plane, you get your money damages. But you don’t get to take over the plane, whether by staying in your seat and fighting off the flight attendants and security, or walking into the cockpit and flying yourself to your destination.