A version of this article originally appeared in Condé Nast Traveller India. If your travel calendar is looking even slightly ambitious, here’s a useful factor to keep in mind before booking your flight: the most well-connected airports in the world. OAG’s Megahubs 2025 ranking reveals how well an international airport has connected you to the rest of the globe last year, based on a simple but telling comparison: These unique rankings are generated by comparing the number of scheduled connections to and from international flights with the number of destinations served from the airport. At the very top, London's Heathrow Airport holds its ground for the second year in a row, clocking nearly 60,000 connections across 226 global destinations.…