F16 under 10000ft near airport

I was flying at 8000ft at mach 1.1 in expert sever near an active airport than I was reported by ATC for exceeding speed near an airport but I did not recieve any notification or warning that I was exceeding speed limitations help?
Grade 4 btw now grade 2;(


This would be the reason why:

Particular attention to the general rule of thumb about flying around 250-300 knots instead of 585 knots. You still have access to the Training and Casual Servers for the next 7-days, we’ll see you back on Expert soon :)