Presumably in order to avoid numerous FOI requests the TSA has made it possible for non-US visitors to review their arrival and departure records via this web site.
You need to supply some data:
Once you have provided this and clicked ‘Get Travel History’ you are presented with a list of your arrivals and departures, back to 2010 for me. Here is an excerpt of my record (dates redacted):
There are some odd entries – INN-KRANEBITTEN is actually US Pre-Clearance at Shannon, Ireland.
Quite why MIA – UNKNOWN, and yet MIA – MIAMI, FL are both valid entries I do not know. Of course the queues at MIA could result from the TSA not knowing Miami International Airport is!
CHI – DISTRICT OFFICE 9, is, I think Chicago O’Hare
Some entries and exits are on the same day as if the information from the airline has not been processed properly.
It is quite fun to see exits and entries but I am not sure it has a great deal of use!