In 1940 An Australian Aircraft Landed On Top Of Another Plane In The Air

It’s September 1940, the second year of WWII, and two Australian pilots are on a training exercise, each accompanied by his navigator. They’re both flying twin-engined Avro Anson aircraft on what should be an entirely routine flight over the Australian bush. But then catastrophe strikes in an entirely unpredictable way. Can the four crewmen come out of it alive?