I work on time-space cartography in a historical perspective and need to establish a commercial speed of Concorde aircraft flights based on timetable data. This issue differs from the issue of the maximum speed of planes, because in a time geography perspective I want to consider speed from the point of view of the user, the traveller, i.e timetable commercial speed, and not maximum aircraft speed.
I found some indicative timetables of London-New York in 3,5 hours for 5 850 km which turns into an approximate value of 1 600 km/h. Could anyone confirm these data and this figure?
A related problem is that time-tables are not symmetric, because of trade winds, so that transatlantic routes take longer from Europe to USA that the contrary. I want to use the longest value since it provides a consistent value for minimum time-distance.