Fun irony (beyond being Friday the 13th): FAA lost radar and frequencies between centers but ADS-B is broadcast by the planes themselves, so a couple hundred hobbyist receivers probably kept the full picture the whole time.
contrary to popular belief, DNS doesn't actually need 24 hours (or whatever) to "propagate". It only needs enough time for caches to expire, if they exist. For non-existent domains this shouldn't be an issue.
DNS controls the length of time an answer is valid (with time-to-live/TTL), some (poorly configured, but for a historical good reason) caching servers ignore the TTL and keep the record much longer (~24 hours).
A non-existent (not yet resolvable) domain, will get an NXDOMAIN response which also gets cached via a TTL setting (which again might be ignored by caching servers).
All that caching - while the current response is still "valid" because the TTL hasn't expired - is what people call "propagation".
contrary to popular belief, DNS doesn't actually need 24 hours (or whatever) to "propagate". It only needs enough time for caches to expire, if they exist. For non-existent domains this shouldn't be an issue.
A non-existent (not yet resolvable) domain, will get an NXDOMAIN response which also gets cached via a TTL setting (which again might be ignored by caching servers).
All that caching - while the current response is still "valid" because the TTL hasn't expired - is what people call "propagation".