Still staggered by how many aircraft are in the air, just looked at Flight radar 24 and approx 5,000 at 7.55 UK time. I know that does not seem many as per normal, but still too many. They are not all cargo flights either. Just have a look yourself at a global view and you can see the bee-hive the USA is ! There are other hot spots visible with so many on approach to airports.
Remember 911 when a visible attack happened in the US all aircraft were grounded almost immediately. Now we have an Invisible attacker which has the potential to kill far more people planes are being allowed to fly WHY ????