Why are fighter jets flying over my house today?

Most overflights of populated areas fall into four categories. The first is training: crews must practise navigation, formation flying and simulated attacks at low level, and many countries set aside low-flying areas and corridors for this. The second is transit: a fighter returning from an exercise or a maintenance visit simply follows an airway like any other traffic, and a house under that route will hear it. The third is ceremonial: flypasts over sports events, national holidays, air shows and military funerals are rehearsed days ahead, so a formation may pass more than once. The fourth is the quick-reaction alert, in which armed fighters scramble to identify an aircraft that has lost radio contact or strayed from its route; these launches are unscheduled and often the loudest, because the jets climb at full power.

Air forces publish low-flying timetables and, in many countries, respond to noise complaints through a dedicated office. Local airfields post exercise dates, and aviation authorities issue notices to airmen (NOTAMs) for flypasts and temporary restricted areas. Flight-tracking websites show many military transports and tankers, though fast jets frequently fly without broadcasting their position. Local news outlets are usually told about large exercises because of the expected noise.

A single deep roar that fades quickly is typically one aircraft in transit. Repeated passes at intervals of a few minutes suggest a circuit or a rehearsal. A sudden, very loud climb with afterburners at an unusual hour is the signature of an alert scramble, the one case in which the jets are responding to something real, and even then the target is almost always an airliner with a radio failure or a light aircraft off course.