Wonderful Engineering - "The shortest distance between two points is always a straight line in Euclidean geometry". This is the geometry that is usually learned in school, where the figures are two-dimensional
Here's A Look At The World's Shortest And Longest Flight Routes
Shortest distances - The Magiscian
Flight Paths and Great Circles - Why Are Great Circles the Shortest Flight Path?
World's Shortest and Longest Flight Routes in the World ⋆ 2YoDoINDIA