Originally Posted by
FlyerChrisK
Does that take into account the possibility of having to divert somewhere else if GUM is unavailable (due to a storm, etc.)?
Saipan is only 130 miles to the north, and has an 8700 ft runway which is plenty for a 777 to land, and plenty enough for a weight-restricted take-off back to GUM.
Rota International is half-way between the two and has 6000ft which might work too if you were really desperate...