Frankfurt Airport (FRA) is one of the world’s largest hubs. Serving as a major connecting hub for Star Alliance carrier Lufthansa and several of its partners across the globe, the airport sees millions of passengers pass through its doors each year. However, in decades prior, the airport had a very different history when it came to airline hubs. Multiple international carriers had extensive operations at the airport, but slowly retreated from the facility as a result of network consolidation efforts.