You might find this interesting - https://en.wikipedia.org/wiki/ETOPS - That's part of what's changed the hub-and-spoke model of the past since twin-engine planes can now go much further from an emergency landing.
By playing around with the ETOPS options on Great Circle Mapper you can see the 787 can fly over any part of the Pacific. Aircraft with lower ETOPS ratings would have had to fly non-direct routes to ensure they didn't stray too far from a usable airport.
http://www.gcmap.com/mapui?P=jfk-syd&MS=wls&DU=mi&E=330
Try dropping the ETOPS to 60 minutes and you'll be able to clearly see where the airports are.