Location Sound App Essential #1 - Flightradar24

So you get to an exterior location and a few years ago if you weren't filming next to London Heathrow you took a chance with airplanes and flight paths but NO MORE!

Flightradar24 tracks all major flights and give you info on destination airport along with where it has come from and gives a tracking line for it's flight path so you can work out if planes will likely affect you all day.

On location you can see all this info in real time and have a pretty good estimate of if a planes going to come mid take.

The app doesn't show helicopters and some smaller personal aircraft so scouting airfields is advised of course Common aircraft models that usually do not have an ADS-B transponder and are not visible on Flightradar24 (within ADS-B coverage):
Antonov An-124 and An-225
ATR 42, 72 (except most new deliveries of ATR 72-600)
Boeing 707, 717, 727, 737-200, 747-100, 747-200, 747SP
BAe Jetstream 31 and 32
All Bombardier CRJ models (except most new deliveries of CRJ-900)
All Bombardier Dash models
All CASA models
All Dornier models
All Embraer models (except most new deliveries of Embraer E190)
De Havilland Canada DHC-6 Twin Otter
Fokker 50
McDonnell Douglas DC-9, MD-8x, MD-90
Saab 340 and 2000
Most helicopters
Most older aircraft
Most business jets
Most military aircraft
Most propeller aircraft

Here is more about how it works

There is a free and paid version of the app so there is no excuse not to have it.