I don't understand how BA through any predecessors can be 100 years old. Aircraft Transport & Travel Ltd started public services in 1919, but closed down and was liquidated at the end of 1920. Handley Page started similar services in 1919, they also closed the service down in 1920, the company carried on of course as an aircraft manufacturer but they never sold out the operation to anything that formed BA. How does this make BA 100 years old this year ?