I ran across this link today eCFR — Code of Federal Regulations that describes the rules of part 107. In part 101 (hobbyist rules) it stipulates that I must notify an airport if I am within five miles of any airport. In part 107 it says that I must obtain authorization when flying in any controlled airspace(class A,B,C,D or E). There is no mention of a distance to an airport. Over ninety percent of airports in the US are in class G airspace(from the surface too 700 AGL or 1200 AGL) which is uncontrolled. Does this mean that I can legally fly closer than 5 miles to and airport, without notification, as long as I maintain appropriate safety measures?