Originally Posted by
chevvron
Musta been something important for Northolt to be open at 9 am Devil
I would guess the 'sneaky beakies' don't broadcast an ADS-B signal for security reasons; be too easy whoever they're looking for to track them on FR24 if they did.
Northolt opens at 8am. And, the spylanders are able to fly well before that and well into the evening and night.
FR24 isn't the only thing you can look at ... there are others.