Originally Posted by
pinniped
Really stupid question: if the distance between ANC and SEA is 1448, then how is the unduplicated flight mileage 1450?
If this is intending to count departures and approaches from/to all different runway combinations, the difference would be more than two miles. Otherwise, why wouldn't it just be 1448?
Good spot! I doubt the intention is to get as precise as distinct runways, and it's simply a typo / accidental discrepancy in level of detail between the two sentences. At any rate, I'm just counting the great circle distance between the airport pair - ignoring the fact that almost certainly a different distance is actually flown, as I presume everyone does when quoting their mileage. This does mean my LGW-LGW counts as 0 miles!