Ali,
I can't anwer your overland question, but I used to frequent the QE2 on her north Atlantic runs. She followed the same track as the Concorde. The QE2's captain at the time would pipe the Concorde's RT over the main broadcast. Everyone would run out to the stern and see this tiny arrow shape appear over the horizon at incredibe speed. Not long after it was overhead you would hear the sonic boom and the entire ship would shake. I felt it many times whilst still in bed and knew what it was. I can't help thinking we have all taken a big step backwards.