I have been doing a lot of reading and research to make sure I fly safe and legal. I live in las vegas and there are three large airports. McCarran, North Las Vegas and Nellis AFB. I was looking at a web site called MapBox, and the three airport "No Fly Zones" cover just about the entire valley. I thought according to DJI the category A large airports were 5 Mile safe szone, 1.5 miles no fly and the rest was 35' to 400 feet. Also the category B were .6 miles no flay and that was it. What is the "current law" for FAA no fly zones. Also I have different apps I found that show different rings and some don't show the smaller airports at all. Thanks for the help.