As someone already mentioned, these are often tracked on Twitter. Just wanted to add: many of these Air Force and government planes use ADS-B so they're easy to follow. Seems to be more tankers and cargo that do. We were able to watch some of the movements to Venezuela and Iran in advance of hostilities. Other interesting things have popped up like US or British intel flights over the Black Sea.

This would be a great thing to add to the apocalypse tracker. Though I guess it might be a bit tricky. Would need to know the baseline of normal operations. And what would be more or less typical while conflicts, like the current one, are ongoing. Then figure out what would be a sufficient deviance from that for alarm thresholds.