Airplanes Speed probable huge error

Although it is not in my interest what I have to mention since I have a big fleet of Trident 3B, I believe there is a huge mess with the airplanes speed. In a few words although distances are measured, as it is supposed to, in miles, most of the planes have a value in knots! I will give an example of 5 planes and their typical cruise speed converted in Mach/knots/miles/km (in parenthesis is the respective speed from the game):
A320___________: 0.79/453/521/839 (454)
B747-200B_____: 0.85/487/561/902 (484)
A380___________: 0.85/487/561/902 (498)*
Trident 3B______: 0.88/504/581/935 (582)
Tupolev Tu-154: 0.85/487/561/902 (559)
As easily can someone see the values of the game for all aircrafts but trident match with those of knots and not miles! There is an exception for A380 probably because you have used 0.87 Mach as cruise speed which is fair enough as speeds above 0.85 to 0.89 is very common thing for an A380. the only correct speed and I mean in miles is I'm afraid Trident 3B. Probably the same happens at most of the aircrafts in the game which means consumption and flight expenses are totally messed up.
Thank you