Correct answer is... 6 m. It is equal to 21 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 American Homebuilts John Doe has 8% percent of it's length. Typical jet airliners has about 35m, so in the comparision American Homebuilts John Doe has 8% of aircrafts like B737 or A320.
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