Last month marked the end of an era when CSA Czech Airlines closed up shop and converted into a holdings company for SmartWings. Before the closure, it was the fifth oldest airline on Earth still standing.Founded in 1923, the airline had been operating for over a century.Which airline takes Czech's place as the fifth oldest airline still in business? We highlight the top 5 oldest airlines in operation.5th Oldest Airline - FinnairStarting with the name Aero, Finnair began services in September 1923. Headquartered in Helsinki, Finland, the air carrier has been a pioneer to connect Europe with North America and Asia.Following World War II, Finland made Finnair its official flag carrier. Business rapidly picked up...