Concord Range

Hi all,
I have a question regading the range of Concord. I have read in a specifications document that the range for this aircraft is 3700 nm. However yesterday I have flown the route LGAV(Athens) - RJAA(Tokyo) which is about 5300 nm without refuelling. I used Mach2 Concord.
Does someone knows which of the above is correct? THanks.
I have a question regading the range of Concord. I have read in a specifications document that the range for this aircraft is 3700 nm. However yesterday I have flown the route LGAV(Athens) - RJAA(Tokyo) which is about 5300 nm without refuelling. I used Mach2 Concord.
Does someone knows which of the above is correct? THanks.