Correct answer is... 22 m. It is equal to 71 ft. Larger aircraft length is often connected to higher passangers or cargo capacity of an aircraft. The longest civil aircraft is 84 m (275 ft) long, so Armstrong Whitworth Apollo has 26% percent of it's length. Typical jet airliners has about 35m, so in the comparision Armstrong Whitworth Apollo has 26% of aircrafts like B737 or A320.
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