nice
Map of reported UFO sightings since 1906

Hmm... you know you should get a map of air traffic. That would be interesting to compare and contrast. @blueemu.

Hmmm... there are some overlaps, certainly, but not a lot of correlation.
Eastern USA, California and the UK are high in both air traffic and UFO sightings. So far, so good.
The central USA is the highest part of the country for air traffic, but the lowest for UFO sightings. Japan and Taiwan have very dense air traffic, but few sightings.
So the UFO map is missing Paris, Rome, Athens, Moscow, China, Taiwan and Japan... all of them dense with air traffic.
I suspect that the correlation is cultural rather than technological. Have you noticed that the incidence of UFO reports rose sharply just as the incidence of reported miracles dropped almost to zero?
Are aliens Little Green Anglo-Saxon Protestants?
You make the call.
Forget alien vs predator . Gasp vs wasp.
Virtually all are in USA and England. Virtually all are in Protestant countries.
Discuss.
There are many other factors besides religion. Also England is Anglican.

"Reported" how? I suspect the answer lies therein.
Googling ESRI, you get some links, including "Is ESRI reliable?" which brings up this quote:
"ESRI data was confirmed to be the most accurate data of all"
Source? www.esri.com
This might just be Google being inane in how they pull answers to common questions, but still, pretty funny.
----
15 minutes later:
The data comes from nuforc.org, who gets their data primarily via English language online submission forms, and a hotline number in the US
From 1950 to 1975 (and probably later), it was apparently just the hotline.
Their database indexes on US States and Canadian provinces, and the rest of the world is lumped under "Unspecified/International", which also implies that they will accept accounts of UFO sightings that do not even have a location associated with them. How robust could they possibly be?
Looking at the state totals is interesting...California has twice as many reports as the next nearest state. You're thinking "I knew it!" right? When you correct for population density, Oregon and Washington state each have more than twice as many UFO reports per capita. The hotline is a Seattle area code.
A large portion of the "international" reports are probably being "passed along" by US citizens who have travelled, would would explain the bias you see in where those reports come from...much heavier numbers from English speaking countries where US travelers can communicate most easily with the locals.
Overall, an excellent example of selection bias.

Some of these reports are hilarious:
1/16/21 20:30 | Orange | VA | Circle | 5 minutes | Looked like the full moon, but was not. |
(Bold text and ominous looking mammal added)
Virtually all are in USA and England. Virtually all are in Protestant countries.
Discuss.