Originally Posted by
star_world
According to the Great Circle Mapper tool, the UA figures are "correct"
Originally Posted by
tvetter01
Why they have different figures, I have no idea, but I have noticed that CO uses "their" numbers to credit all partner flights. (IAH-DEN is where I first noticed it).
Might it be that CO uses the location of the old airport in Denver (Stapleton International Airport)?
It happens to be a bit south-west of Denver International Airport, which inherited the airport code, DEN, from the old one. I.e. closer to SFO and ONT.
EDIT: The two airports are about 13 miles apart... with the old airport being roughly on the straight line connecting DEN-ONT... and a little of the DEN-SFO line. This could explain that CO has SFO-DEN to be 11 miles shorter than UA, and ONT-DEN to be 13 miles shorter.