4 ms·
It's not unreasonable that the SR 71 was listening on the frequency of the airspace beneath them - if the're had been an emergency, it's always better to have a
by chinathrow 6y ago
It's not unreasonable that the SR 71 was listening on the frequency of the airspace beneath them - if the're had been an emergency, it's always better to have a picture of who's on the frequency/within that airspace.