Berlin Tegel Airport notable, non-fatal incidents involving airline operations occurred at Tegel. These include commercial flights that were about to depart or had actually departed/arrived as well as unscheduled stopovers: There were also two Cold war era incidents relating to an American and a British airliner that had departed Tegel on international non-scheduled passenger services. Both of these occurred in Bulgarian airspace. The former was a charter flight carrying German holidaymakers to the Bulgarian Black Sea coast, the latter a migrant charter en route to Turkey: Berlin Tegel Airport Berlin Tegel "Otto Lilienthal" Airport () is the main international airport of Berlin, the
Airport city Airport city Airport city is the "inside the fence" airport area including the airport (terminals, apron, and runways) and on-airport businesses such as air cargo, logistics, offices, retail, and hotels. The airport city is at the core of the aerotropolis, a new urban form evolving around many major airports. The airport city model recognises that an airport can do more than perform its traditional aeronautical services, evolving new non-aeronautical commercial facilities, services and revenue streams. Airports are now routinely targeting non-aeronautical revenue streams amounting to 40–60% of their total revenues. Industry leaders and researchers share best practices on non-aeronautical revenues