You are correct in your thinking.
However...We're talking advertising here.
So once again I’ll post:
(Especially for the certain flights they used to make the commercial data from.)
They didn't have to tell you that the 590 is average for their LA to NY flights only.
If I told you that I flew faster than the speed of sound on a trip the other day, would that be a lie? Think about it.
No reason the ad can't have a little note in very small print that says something to the effect of: Based on east bound routes longer than 750 miles.
