I want to get flight information by using this →
{range lat 36.897669 40.897669} {range lon -79.03655 -75.03655} All flights with a last reported position +/- 2 degrees of the Whitehouse
That works fine and returns results for me. Be sure that you are escaping the characters properly, if your URL request library does not automatically handle it properly for you. Here is how the fully-escaped version should look:
Keep in mind that there may not always be flights within the latlon box that you’re specifying so there may legitimately be 0 at some times of the day.