Bombardier might be using TAS, which is true airspeed. If you have a groundspeed of 440kts and have a 20kt headwind, your TAS would obviously be 460kts. TAS increases roughly 2% for each 1000ft of density altitude.
You know that I have the highest respect for your technical knowledge but that's not correct.
If you have a TAS of 460kts and a tailwind of 100kts, your TAS is still 460kts. Your GROUNDSPEED, however, will now be 560kts.
TAS: the actual speed your airplane moves through undisturbed air
CAS(Calibrated Airspeed): indicated airspeed(IAS)corrected for installation and instrument errors
"Manufacturers use IAS primarily as a basis for determining aircraft performance"
(takeoff, landing, climb, fuel burn etc.)
At altitudes above fl290
mach is used, not IAS. The reason the manufacturers generally list performance in KTS and not Mach, is because the people that BUY the airplanes, generally drive cars, not airplanes.
Just like the man says: For an approximate conversion, add 2% of IAS for every 1,000feet.
Lear 45 at 35,000ft at an Indicated airspeed of 270kts(m.79).......35,000/1,000=35 .02*270=5.4 5.4*35=189 189+270=459
and "have a nice day" 8)