The radius of 150 air miles is correct.

However, FMCSA states:
The term “air mile” is internationally defined as a “nautical mile” which is equivalent to 6,076 feet or 1,852 meters. Thus, the 100 air miles are equivalent to 115.08 statute miles or 185.2 kilometers.

See question 12
https://www.fmcsa.dot.gov/regulations/title49/part/395

Thus making 150 air miles equal to 911,400 ft or 172.6136 statute miles. (statute mile is equal to 5280ft and is the unit of measure for land distances.