I'm watching it live on ADSBexhange, here's a flight I picked at random going approximately past me that'll land in Detroit about an hour from now... there's not much left over the US over 40,000 feet. Only 2 planes over Indiana at that altitude right now.
https://globe.adsbexchange.com/?icao=a519b8
It's Delta Airlines flight 1070
https://www.flightaware.com/live/flight/DAL1070
Edit: It landed safely. Continuing to watch our airspace clear out, most traffic at 40,000+ feet is inbound international flights
To be fair, above FL400 4̶0̶A̶G̶L̶ is relatively high for most airliners. Most are between FL300 and FL400.
I'm also near Detroit and am watching the trackers and I'm pretty sure I just saw N831AK take off from Troy Oakland in violation of the grounding order. I wonder how common that is.
Looks like some flights are taking off from JFK https://globe.adsbexchange.com/?icao=4cc58a
I'm watching ADSBexchange too.
It's eerie seeing the total number of aircraft tracked decrease. I put on a filter for 1000' to 80000', to exclude aircraft on the ground, and the number was around 12K when I started watching. It's down to just over 9.4K now. Wild.
Edit: 22 minutes later and the count is down to 8.4K.