Kármán line
However, other sources reject this explanation and suggest that Kármán did not endorse the FAI decision. Thomas Gangale notes that the term "von Kármán line" was initially coined by Andrew G. Haley in reference to the 275,000 foot figure, and that in the following decades "the literature citing the von Kármán line as 275,000 feet, 52.08 statute miles, or 83.81 kilometers is extensive and fairly continuous". Gangale quotes Haley in noting the 100 km line was the effect of agreement between U.S. and Soviet Union delegates of FAI in 1961, and observes "it is not clear that the von Kármán calculation and the IAF number ever had anything to do with each other."