the invisible highways where physics, politics, and ticket prices argue until one wins.
means a flight route is the scheduled path an airline flies between two airports, chosen for demand, fuel, and airspace rules, not the straightest line on a map.
from early airmail contracts in the 1920s forced pilots to fly fixed paths between postal hubs, and when passengers replaced mailbags the routes stuck, ossifying into the hub-and-spoke networks airlines still defend today.
singapore to newark — 18ish hours nonstop, longest scheduled commercial flight on earth
heathrow to jfk — busiest intercontinental route, over 2.9 million seats a year
lax to hnl — pacific route that basically built hawaiian tourism
qantas kangaroo route — sydney to london, once needed nine refueling stops in 1947