So I thought of using the Concorde online to help get my Flight Rank up so I can start joining the more professional servers with more responsive ATC and lively airports however I seem to be severely speed limited at my cruising altitude. Where my filed airspeed is over 1000kn, I was able to get up to around 600kn before the speed limit notches on the Airspeed indicator began to force me down into a painful 290kn. Any reason for this, have I done something incorrectly at any point?