Hello Pilots, I am a part 107 certified pilot in the US. The B4UFly app is telling me I have an airport nearby. It's a small, unpaved field that, as far as I know, is not in operation or has very minimal use. As a newbie to sectional charts, I am trying to find out if this airport is in controlled airspace and if I need to contact ATC like the app is telling me to. It is not on the sectional chart. What is the best way to determine the airspace around this airport, or should I just assume I am good since the airport is not listed on the chart? Thanks.